31020512013 has 12 divisors (see below), whose sum is σ = 47165691040. Its totient is φ = 19591902216.

The previous prime is 31020512009. The next prime is 31020512071. The reversal of 31020512013 is 31021502013.

It is not a de Polignac number, because 31020512013 - 2² = 31020512009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020512513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90703081 + ... + 90703422.

Almost surely, 2^31020512013 is an apocalyptic number.

It is an amenable number.

31020512013 is a deficient number, since it is larger than the sum of its proper divisors (16145179027).

31020512013 is a wasteful number, since it uses less digits than its factorization.

31020512013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181406528 (or 181406525 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The spelling of 31020512013 in words is "thirty-one billion, twenty million, five hundred twelve thousand, thirteen".