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