31511532012 has 48 divisors (see below), whose sum is σ = 75458003712. Its totient is φ = 10231318080.

The previous prime is 31511531981. The next prime is 31511532049. The reversal of 31511532012 is 21023511513.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133578 + ... + 284369.

It is an arithmetic number, because the mean of its divisors is an integer number (1572041744).

Almost surely, 2^31511532012 is an apocalyptic number.

It is an amenable number.

31511532012 is an abundant number, since it is smaller than the sum of its proper divisors (43946471700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31511532012 is a wasteful number, since it uses less digits than its factorization.

31511532012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418118 (or 418116 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 31511532012 in words is "thirty-one billion, five hundred eleven million, five hundred thirty-two thousand, twelve".