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231 (number)

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231
  
232 →

Factorization
  
3 × 7 × 11

Binary
  
111001112

Cardinal
  
two hundred thirty-one

Roman numeral
  
CCXXXI

Ordinal
  
231st (two hundred and thirty-first)

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

Contents

In mathematics

Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, hexagonal number, octahedral number, centered octahedral number, the number of integer partitions of 16, Mertens function returns 0, 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

    231 (number) Wikipedia
    (Text) CC BY-SA