31540320451512 has 96 divisors (see below), whose sum is σ = 91979499034800. Its totient is φ = 9727290565632.

The previous prime is 31540320451501. The next prime is 31540320451561. The reversal of 31540320451512 is 21515402304513.

31540320451512 is a `hidden beast` number, since 3 + 1 + 540 + 3 + 20 + 45 + 1 + 51 + 2 = 666.

It is a super-2 number, since 2×31540320451512² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218302663 + ... + 218447094.

Almost surely, 2^{31540320451512} is an apocalyptic number.

It is an amenable number.

31540320451512 is an abundant number, since it is smaller than the sum of its proper divisors (60439178583288).

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

31540320451512 is a wasteful number, since it uses less digits than its factorization.

31540320451512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436749845 (or 436749838 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 31540320451512 in words is "thirty-one trillion, five hundred forty billion, three hundred twenty million, four hundred fifty-one thousand, five hundred twelve".