31811964612 has 48 divisors (see below), whose sum is σ = 78716820672. Its totient is φ = 9964661760.

The previous prime is 31811964607. The next prime is 31811964641. The reversal of 31811964612 is 21646911813.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 9912 + ... + 252432.

It is an arithmetic number, because the mean of its divisors is an integer number (1639933764).

Almost surely, 2^31811964612 is an apocalyptic number.

It is an amenable number.

31811964612 is an abundant number, since it is smaller than the sum of its proper divisors (46904856060).

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

31811964612 is a wasteful number, since it uses less digits than its factorization.

31811964612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243188 (or 243186 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The spelling of 31811964612 in words is "thirty-one billion, eight hundred eleven million, nine hundred sixty-four thousand, six hundred twelve".