1,000,000,000

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
Senary	2431212453446
Octal	73465450008
Duodecimal	23AA9385412
Hexadecimal	3B9ACA0016

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.

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 rare and is used primarily to ease understanding among both native and non-native speakers of English to clarify relative comparative understanding of the term, as many other languages use words similar to "billion" (e.g. Spanish billón, or Finnish biljoona) to mean one trillion (1,000,000,000,000 or a million millions).

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

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 (e.g. Hungarian (Magyar) milliárd, Indonesian miliar, Polish miliard, Danish milliard, Spanish millardo, French milliard, Italian miliardo, Icelandic milljarður, German Milliarde, Hebrew מיליארד, Finnish miljardi, Dutch miljard, Croatian milijarda, Serbian милијарда, Bulgarian милиард, Russian миллиард, Czech miliarda, Arabic مليار, Romanian miliard, Swedish miljard, Norwegian milliard, Turkish milyar, Esperanto miliardo).

The SI prefix giga indicates 1,000,000,000 times the base unit. Despite this, B remains the common abbreviation for this number.

See Orders of magnitude (numbers) for larger numbers; and long and short scales.

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

Visualisation of powers of ten from one to 1 billion

• 1000000007 – smallest prime number with 10 digits.
• 1023456789 – smallest pandigital number in base 10.
• 1026753849 – smallest pandigital square that includes 0.
• 1073676287 – 15th Carol number.
• 1073741824 – 2³⁰
• 1073807359 – 14th Kynea number.
• 1129760415 – 23rd Motzkin number.
• 1134903170 – 45th Fibonacci number.
• 1162261467 – 3¹⁹
• 1220703125 – 5¹³
• 1234567890 – pandigital number with the digits in order.
• 1311738121 – 25th Pell number.
• 1382958545 – 15th Bell number.
• 1406818759 – 30th Wedderburn–Etherington number.
• 1836311903 – 46th Fibonacci number.
• 1882341361 – The least prime whose reversal is both square (40391²) and triangular (triangular of 57121).
• 1977326743 – 7¹¹
• 2147483647 – 8th Mersenne prime and the largest signed 32-bit integer.
• 2147483648 – 2³¹
• 2176782336 – 6¹²
• 2214502422 – 6th primary pseudoperfect number.
• 2357947691 – 11⁹
• 2971215073 – 11th Fibonacci prime (47th Fibonacci number).
• 3166815962 – 26th Pell number.
• 3192727797 – 24th Motzkin number.
• 3323236238 – 31st Wedderburn–Etherington number.
• 3405691582 – hexadecimal CAFEBABE; used as a placeholder in programming.
• 3405697037 – hexadecimal CAFED00D; used as a placeholder in programming.
• 3735928559 – hexadecimal DEADBEEF; used as a placeholder in programming.
• 3486784401 – 3²⁰
• 4294836223 – 16th Carol number.
• 4294967291 – Largest prime 32-bit unsigned integer.
• 4294967295 – Maximum 32-bit unsigned integer (FFFFFFFF₁₆), perfect totient number, product of the five prime Fermat numbers..
• 4294967296 – 2³²
• 4294967297 – the first composite Fermat number.
• 4295098367 – 15th Kynea number.
• 4807526976 – 48th Fibonacci number.
• 5784634181 – 13th alternating factorial.
• 6103515625 – 5¹⁴
• 6210001000 – only self-descriptive number in base 10.
• 6227020800 – 13!
• 6975757441 – 17⁸
• 6983776800 – 15th colossally abundant number, 15th superior highly composite number
• 7645370045 – 27th Pell number.
• 7778742049 – 49th Fibonacci number.
• 7862958391 – 32nd Wedderburn–Etherington number.
• 8589869056 – 6th perfect number.
• 8589934592 – 2³³
• 9043402501 – 25th Motzkin number.
• 9814072356 – largest square pandigital number, largest pandigital pure power.
• 9876543210 – largest number without redundant digits.
• 9999999967 – greatest prime number with 10 digits.

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).
• About 10⁹ minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10⁹ minutes is roughly 1,900 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 114,000 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 2.7 million years.)
• About 10⁹ months ago, dinosaurs walked the Earth during the late Cretaceous. (10⁹ months is roughly 82 million years.)
• About 10⁹ years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
• 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 gigameter) is almost three times the distance from the Earth to the Moon.
• 10⁹ kilometres is over six times the distance from the Earth to the Sun.

Finance

• The possession of assets with total value of 10⁹ United States dollars would place a person among the world's wealthiest individuals.
• As visualized in a work by artist Michael Marcovici, this amount of money in stacks of hundred-dollar bills can fit on twelve wrapped pallets.

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 millimeters in a cubic meter.
• 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.

Natural landscape

A small mountain, slightly larger than Stone Mountain Georgia, United States, would weigh (have a mass of) a billion tons.

Count

A is a cube; B consists of 1000 cubes of type A, C consists of 1000 Bs; and D consists of 1000 Cs. Thus there are 1 million As in C; and 1,000,000,000 As in D.