31981692912 has 40 divisors (see below), whose sum is σ = 88974711504. Its totient is φ = 9840520704.

The previous prime is 31981692893. The next prime is 31981692937. The reversal of 31981692912 is 21929618913.

It is a congruent number.

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, 25625733 + ... + 25626980.

Almost surely, 2^31981692912 is an apocalyptic number.

It is an amenable number.

31981692912 is an abundant number, since it is smaller than the sum of its proper divisors (56993018592).

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

31981692912 is a wasteful number, since it uses less digits than its factorization.

31981692912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51252737 (or 51252731 counting only the distinct ones).

The product of its digits is 419904, while the sum is 51.

The spelling of 31981692912 in words is "thirty-one billion, nine hundred eighty-one million, six hundred ninety-two thousand, nine hundred twelve".