243 (number)

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

← 242 243 244 →
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Cardinal	two hundred forty-three
Ordinal	243rd (two hundred forty-third)
Factorization	3^5
Greek numeral	ΣΜΓ´
Roman numeral	CCXLIII
Binary	111100112
Ternary	1000003
Octal	3638
Duodecimal	18312
Hexadecimal	F316

In mathematics

243 is:

• the only 3-digit number that is a fifth power (3⁵).
• a perfect totient number.[1]
• 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

References

1. "Sloane's A082897 : Perfect totient numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.