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31 (thirty-one) is a positive integer following 30 and preceding 32. Its ordinal form is written "thirty-first" or "31st".

Properties Edit

31 is an odd prime number. It is a Mersenne prime, since it is equal to 2^5-1.

In googology Edit

In Greek-based number-naming systems, 31 is associated with prefix "hentriaconta-", and with prefix "untriginti-" in Latin systems.

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