12931631 has 2 divisors, whose sum is σ = 12931632. Its totient is φ = 12931630.

The previous prime is 12931621. The next prime is 12931643. The reversal of 12931631 is 13613921.

12931631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13613921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12931631 - 2¹⁸ = 12669487 is a prime.

It is a super-2 number, since 2×12931631² = 334454160640322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12931631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12931601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465815 + 6465816.

It is an arithmetic number, because the mean of its divisors is an integer number (6465816).

Almost surely, 2^12931631 is an apocalyptic number.

12931631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931631 is an equidigital number, since it uses as much as digits as its factorization.

12931631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 12931631 is about 3596.0577025404. The cubic root of 12931631 is about 234.7205430149.

The spelling of 12931631 in words is "twelve million, nine hundred thirty-one thousand, six hundred thirty-one".