1,000,000,000

See also: Orders of magnitude (numbers) and Long and short scales

1000000000
List of numbers — Integers ← 100 101 102 103 104 105 106 107 108 109
Cardinal	One billion (short scale) One thousand million, or one milliard (long scale)
Ordinal	One billionth (short scale)
Factorization	29 · 59
Greek numeral	${\stackrel {\iota }{\mathrm {M} }}$
Roman numeral	M
Binary	1110111001101011001010000000002
Ternary	21202002000210100013
Quaternary	3232122302200004
Quinary	40220000000005
Senary	2431212453446
Octal	73465450008
Duodecimal	23AA9385412
Hexadecimal	3B9ACA0016
Vigesimal	FCA000020
Base 36	GJDGXS36

1,000,000,000 (one billion, short scale; one thousand million or milliard, yard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001. One billion can also be written as b or bn.

In scientific notation, it is written as 1 × 10⁹. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G.

One billion years may be called eon/aeon in astronomy or geology.

Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However, this is no longer as common as earlier, and the word has been used to mean one thousand million (1,000,000,000) for some time. The alternative term "one thousand million" is mainly used in the U.K., or countries such as Spain that uses "one thousand million" as one million million constitutes a billion. The worded figure, as opposed to the numerical figure (one thousand million/1,000,000,000) is used to differentiate between "one thousand million" or "one billion".

The term milliard can also be used to refer to 1,000,000,000; whereas "milliard" is seldom used in English, variations on this name often appear in other languages.

In the South Asian numbering system, it is known as 100 crore or 1 arab.

Visualisation of powers of ten from one to 1 billion

Sense of scale

The facts below give a sense of how large 1,000,000,000 (10⁹) is in the context of time according to current scientific evidence:

• 10⁹ seconds is 114 days short of 32 calendar years (≈ 31.7 years).
• More precisely, a billion seconds is exactly 31 years, 8 months, 2 weeks, 1 day, 17 hours, 46 minutes, and 40 seconds.
• About 10⁹ minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10⁹ minutes is roughly 1,901 years.)
• About 10⁹ hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10⁹ hours is roughly 114,080 years.)
• About 10⁹ days ago, Australopithecus, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10⁹ days is roughly 2.738 million years.)
• About 10⁹ months ago, dinosaurs walked the Earth during the late Cretaceous. (10⁹ months is roughly 83.3 million years.)
• About 10⁹ years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
• About 10⁹ decades ago, galaxies began to appear in the early Universe which was then 3.799 billion years old. (10⁹ decades is roughly 10 billion years.)
• It takes approximately 95 years to count from one to one billion in a single sitting.
• The universe is thought to be about 13.8 × 10⁹ years old.

Distance

• 10⁹ inches is 15,783 miles (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
• 10⁹ metres (called a gigametre) is almost three times the distance from the Earth to the Moon.
• 10⁹ kilometres (called a terameter) is over six times the distance from the Earth to the Sun.

Area

• A billion square inches would be a square about one half mile on a side.
• A piece of finely woven bed sheet cloth that contained a billion holes would measure about 500 square feet (46 m²), large enough to cover a moderate sized apartment.

Volume

• There are a billion cubic millimetres in a cubic metre and there are a billion cubic metres in a cubic kilometre.
• A billion grains of table salt or granulated sugar would occupy a volume of about 2.5 cubic feet (0.071 m³).
• A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.

Weight

• Any object that weighs one billion kilograms (2.2×10⁹ lb) would weigh about as much as 5,525 empty Boeing 747-400s.
• A cube of iron that weighs one billion pounds (450,000,000 kg) would be 1,521 feet 4 inches (0.28813 mi; 463.70 m) on each side.

Products

• As of July 2016, Apple has sold one billion iPhones. This makes the iPhone one of the most successful product lines in history, surpassing the PlayStation and the Rubik's Cube.
• As of July 2016, Facebook has 1.71 billion users.

Nature

• A small mountain, slightly larger than Stone Mountain in Georgia, United States, would weigh (have a mass of) a billion tons.
• There are billions of worker ants in the largest ant colony in the world, which covers almost 4,000 miles (6,400 km) of the Mediterranean coast.
• In 1804, the world population was one billion.

Count

A is a cube; B consists of 1000 cubes the size of cube A, C consists of 1000 cubes the size of cube B; and D consists of 1000 cubes the size of cube C. Thus there are 1 million A-sized cubes in C; and 1,000,000,000 A-sized cubes in D.

Selected 10-digit numbers (1,000,000,001–9,999,999,999)

1,000,000,001 to 1,999,999,999

• 1,000,000,007 – smallest prime number with 10 digits.
• 1,023,456,789 – smallest pandigital number in base 10.
• 1,026,753,849 – smallest pandigital square that includes 0.
• 1,073,676,287 – 15th Carol number.
• 1,073,741,824 – 2³⁰
• 1,073,807,359 – 14th Kynea number.
• 1,111,111,111 – repdigit, also a special number relating to the passing of Unix time.
• 1,129,760,415 – 23rd Motzkin number.
• 1,134,903,170 – 45th Fibonacci number.
• 1,162,261,467 – 3¹⁹
• 1,220,703,125 – 5¹³
• 1,232,922,769 – Centered hexagonal number.
• 1,234,567,890 – pandigital number with the digits in order.
• 1,311,738,121 – 25th Pell number.
• 1,382,958,545 – 15th Bell number.
• 1,406,818,759 – 30th Wedderburn–Etherington number.
• 1,475,789,056 – 14⁸
• 1,631,432,881 – Triangular square number.
• 1,836,311,903 – 46th Fibonacci number.
• 1,882,341,361 – The least prime whose reversal is both square (40391²) and triangular (triangular of 57121).
• 1,977,326,743 – 7¹¹

2,000,000,000 to 2,999,999,999

• 2,038,074,743 – 100,000,000th prime number
• 2,147,483,647 – 8th Mersenne prime and the largest signed 32-bit integer.
• 2,147,483,648 – 2³¹
• 2,176,782,336 – 6¹²
• 2,214,502,422 – 6th primary pseudoperfect number.
• 2,357,947,691 – 11⁹
• 2,562,890,625 – 15⁸
• 2,971,215,073 – 11th Fibonacci prime (47th Fibonacci number).

3,000,000,000 to 3,999,999,999

• 3,166,815,962 – 26th Pell number.
• 3,192,727,797 – 24th Motzkin number.
• 3,323,236,238 – 31st Wedderburn–Etherington number.
• 3,405,691,582 – hexadecimal CAFEBABE; used as a placeholder in programming.
• 3,405,697,037 – hexadecimal CAFED00D; used as a placeholder in programming.
• 3,735,928,559 – hexadecimal DEADBEEF; used as a placeholder in programming.
• 3,486,784,401 – 3²⁰

4,000,000,000 to 4,999,999,999

• 4,294,836,223 – 16th Carol number.
• 4,294,967,291 – Largest prime 32-bit unsigned integer.
• 4,294,967,295 – Maximum 32-bit unsigned integer (FFFFFFFF₁₆), perfect totient number, product of the five prime Fermat numbers $F_{0}$ through $F_{4}$.
• 4,294,967,296 – 2³²
• 4,294,967,297 – $F_{5}$, the first composite Fermat number.
• 4,295,098,367 – 15th Kynea number.
• 4,807,526,976 – 48th Fibonacci number.

5,000,000,000 to 5,999,999,999

• 5,159,780,352 – 12⁹
• 5,784,634,181 – 13th alternating factorial.

6,000,000,000 to 6,999,999,999

• 6,103,515,625 – 5¹⁴
• 6,210,001,000 – only self-descriptive number in base 10.
• 6,227,020,800 – 13!
• 6,975,757,441 – 17⁸
• 6,983,776,800 – 15th colossally abundant number, 15th superior highly composite number

7,000,000,000 to 7,999,999,999

• 7,645,370,045 – 27th Pell number.
• 7,778,742,049 – 49th Fibonacci number.
• 7,862,958,391 – 32nd Wedderburn–Etherington number.

8,000,000,000 to 8,999,999,999

• 8,589,869,056 – 6th perfect number.
• 8,589,934,592 – 2³³

9,000,000,000 to 9,999,999,999

• 9,043,402,501 – 25th Motzkin number.
• 9,814,072,356 – largest square pandigital number, largest pandigital pure power.
• 9,876,543,210 – largest number without redundant digits.
• 9,999,999,967 – greatest prime number with 10 digits.