31912012931 has 16 divisors (see below), whose sum is σ = 33198197760. Its totient is φ = 30638539680.

The previous prime is 31912012921. The next prime is 31912012981. The reversal of 31912012931 is 13921021913.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31912012931 is a prime.

It is a super-2 number, since 2×31912012931² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31912012921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7053236 + ... + 7057758.

It is an arithmetic number, because the mean of its divisors is an integer number (2074887360).

Almost surely, 2^31912012931 is an apocalyptic number.

31912012931 is a deficient number, since it is larger than the sum of its proper divisors (1286184829).

31912012931 is a wasteful number, since it uses less digits than its factorization.

31912012931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 31912012931 in words is "thirty-one billion, nine hundred twelve million, twelve thousand, nine hundred thirty-one".