243 (number)
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| Cardinal | two hundred forty-three | |||
| Ordinal |
243rd (two hundred forty-third) | |||
| Factorization | 35 | |||
| Greek numeral | ΣΜΓ´ | |||
| Roman numeral | CCXLIII | |||
| Binary | 111100112 | |||
| Ternary | 1000003 | |||
| Quaternary | 33034 | |||
| Quinary | 14335 | |||
| Senary | 10436 | |||
| Octal | 3638 | |||
| Duodecimal | 18312 | |||
| Hexadecimal | F316 | |||
| Vigesimal | C320 | |||
| Base 36 | 6R36 | |||
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.[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.
- 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
- ↑ "Sloane's A082897 : Perfect totient numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
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