31351930812 has 36 divisors (see below), whose sum is σ = 79264174080. Its totient is φ = 10448868672.

The previous prime is 31351930789. The next prime is 31351930823. The reversal of 31351930812 is 21803915313.

31351930812 is a `hidden beast` number, since 31 + 3 + 519 + 30 + 81 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150264 + ... + 292032.

Almost surely, 2^31351930812 is an apocalyptic number.

It is an amenable number.

31351930812 is an abundant number, since it is smaller than the sum of its proper divisors (47912243268).

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

31351930812 is a wasteful number, since it uses less digits than its factorization.

31351930812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147922 (or 147917 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 31351930812 in words is "thirty-one billion, three hundred fifty-one million, nine hundred thirty thousand, eight hundred twelve".