231 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred thirty-one | |||
| Ordinal |
231st (two hundred and thirty-first) | |||
| Factorization | 3 × 7 × 11 | |||
| Roman numeral | CCXXXI | |||
| Binary | 111001112 | |||
| Ternary | 221203 | |||
| Quaternary | 32134 | |||
| Quinary | 14115 | |||
| Senary | 10236 | |||
| Octal | 3478 | |||
| Duodecimal | 17312 | |||
| Hexadecimal | E716 | |||
| Vigesimal | BB20 | |||
| Base 36 | 6F36 | |||
231 (two hundred [and] thirty-one) is the natural number following 230 and preceding 232.
In mathematics
Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, hexagonal number, octahedral number,[1] centered octahedral number,[2] the number of integer partitions of 16, Mertens function returns 0,[3] and is the number of cubic inches in a U.S. liquid gallon.
In chemistry
- Ac-231 is an isotope of actinium.
- Am-231 is an artificial isotope of americium.
- Pa-231 is a naturally occurring isotope of protactinium.
- Ra-231 is an isotope of radium.
- Th-231 is an isotope of thorium.
In other fields
231 is:
- The year A.D. 231 or 231 BC.
- +231 is the country code for Liberia.
- Pacific 231, an orchestral work by French composer Arthur Honegger.
- Pacific 231, a 1949 short film directed by Jean Mitry.
- M-231 (Michigan highway), a highway in Michigan
References
- ↑ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.
- ↑ "Sloane's A001845 : Centered octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.
- ↑ "Sloane's A028442 : Numbers n such that Mertens' function is zero". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.
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