231 (number)

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Short description: Natural number
← 230 231 232 →
Cardinaltwo hundred thirty-one
Ordinal231st
(two hundred thirty-first)
Factorization3 × 7 × 11
Greek numeralΣΛΑ´
Roman numeralCCXXXI
Binary111001112
Ternary221203
Quaternary32134
Quinary14115
Senary10236
Octal3478
Duodecimal17312
HexadecimalE716
VigesimalBB20
Base 366F36

231 (two hundred [and] thirty-one) is the natural number following 230 and preceding 232.

Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, doubly 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.

References

  1. ↑ "Sloane's A005900 : Octahedral numbers". OEIS Foundation. https://oeis.org/A005900. 
  2. ↑ "Sloane's A001845 : Centered octahedral numbers". OEIS Foundation. https://oeis.org/A001845. 
  3. ↑ "Sloane's A028442 : Numbers n such that Mertens' function is zero". OEIS Foundation. https://oeis.org/A028442. 



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