31881294105912 has 96 divisors (see below), whose sum is σ = 88000577683200. Its totient is φ = 10424683063872.

The previous prime is 31881294105911. The next prime is 31881294105919. The reversal of 31881294105912 is 21950149218813.

31881294105912 is a `hidden beast` number, since 3 + 1 + 8 + 8 + 1 + 2 + 9 + 41 + 0 + 591 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31881294105911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12673198 + ... + 14979069.

It is an arithmetic number, because the mean of its divisors is an integer number (916672684200).

Almost surely, 2^{31881294105912} is an apocalyptic number.

It is an amenable number.

31881294105912 is an abundant number, since it is smaller than the sum of its proper divisors (56119283577288).

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

31881294105912 is a wasteful number, since it uses less digits than its factorization.

31881294105912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27652585 (or 27652578 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 31881294105912 in words is "thirty-one trillion, eight hundred eighty-one billion, two hundred ninety-four million, one hundred five thousand, nine hundred twelve".