31931938812 has 12 divisors (see below), whose sum is σ = 74507857256. Its totient is φ = 10643979600.

The previous prime is 31931938747. The next prime is 31931938853. The reversal of 31931938812 is 21883913913.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1330497439 + ... + 1330497462.

Almost surely, 2^31931938812 is an apocalyptic number.

It is an amenable number.

31931938812 is an abundant number, since it is smaller than the sum of its proper divisors (42575918444).

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

31931938812 is a wasteful number, since it uses less digits than its factorization.

31931938812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660994908 (or 2660994906 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The spelling of 31931938812 in words is "thirty-one billion, nine hundred thirty-one million, nine hundred thirty-eight thousand, eight hundred twelve".