243 (number)

← 242 243 244 →
← 240 241 242 243 244 245 246 247 248 249 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-three
Ordinal	243rd (two hundred forty-third)
Factorization	35
Greek numeral	ΣΜΓ´
Roman numeral	CCXLIII
Binary	111100112
Ternary	1000003
Senary	10436
Octal	3638
Duodecimal	18312
Hexadecimal	F316

243 (two hundred [and] forty-three) is the natural number following 242 and preceding 244.

In mathematics

243 is:

• the only 3-digit number that is a fifth power (3⁵).
• a perfect totient number.
• the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59).
• an 82-gonal number.
• a Harshad number.

In other fields

243 is:

• the Calling code for the Democratic Republic of the Congo, the country once known as Zaire.
• the year 243 AD or 243 BC.
• an Aircraft emergency frequency (243.0 MHz) for military aircraft.
• Aloha Airlines Flight 243 which suffered an explosive decompression near Maui, HI on April 28, 1988
• .243 Winchester and .243 WSSM, rifle rounds
• The number of Earth Days for the planet Venus to complete one Venusian day, one revolution
• A song from Laggan Rhye with the title 3⁵ is about 3⁵ and 243, using the difference between a nautical mile and a statute mile in meters.