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31 (number)

Field	Value
number	31
factorization	prime
prime	11th
divisor	1, 31

31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.

Mathematics

31 is a prime number, a twin prime (with 29), and a Mersenne prime.

In other fields

31 equal temperament is a popular microtonal tuning for musical instruments because it provides a good approximation of harmonic intervals.

January, March, May, July, August, October and December have 31 days.

California was the 31st state to join the United States.

31 is the international calling code for the Netherlands.

Notes

References

{{Cite OEIS. A077800. List of twin primes {p, p+2}.
{{Cite OEIS. A000668. Mersenne primes (primes of the form 2^n - 1).

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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