31939918472 has 32 divisors (see below), whose sum is σ = 74664745920. Its totient is φ = 12444123840.

The previous prime is 31939918433. The next prime is 31939918541. The reversal of 31939918472 is 27481993913.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25924643 + ... + 25925874.

It is an arithmetic number, because the mean of its divisors is an integer number (2333273310).

Almost surely, 2^31939918472 is an apocalyptic number.

It is an amenable number.

31939918472 is an abundant number, since it is smaller than the sum of its proper divisors (42724827448).

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

31939918472 is a wasteful number, since it uses less digits than its factorization.

31939918472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51850541 (or 51850537 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 56.

The spelling of 31939918472 in words is "thirty-one billion, nine hundred thirty-nine million, nine hundred eighteen thousand, four hundred seventy-two".