12931 has 4 divisors (see below), whose sum is σ = 13192. Its totient is φ = 12672.
The previous prime is 12923. The next prime is 12941. The reversal of 12931 is 13921.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 12931 - 23 = 12923 is a prime.
It is a super-2 number, since 2×129312 = 334421522, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (12911) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30 + ... + 163.
It is an arithmetic number, because the mean of its divisors is an integer number (3298).
212931 is an apocalyptic number.
12931 is a deficient number, since it is larger than the sum of its proper divisors (261).
12931 is an equidigital number, since it uses as much as digits as its factorization.
12931 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 260.
The product of its digits is 54, while the sum is 16.
The square root of 12931 is about 113.7145549171. The cubic root of 12931 is about 23.4716725217.
Subtracting 12931 from its reverse (13921), we obtain a triangular number (990 = T44).
The spelling of 12931 in words is "twelve thousand, nine hundred thirty-one".
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