31541972136 has 32 divisors (see below), whose sum is σ = 78863488800. Its totient is φ = 10512849600.

The previous prime is 31541972107. The next prime is 31541972141. The reversal of 31541972136 is 63127914513.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171255 + ... + 303993.

It is an arithmetic number, because the mean of its divisors is an integer number (2464484025).

Almost surely, 2^31541972136 is an apocalyptic number.

It is an amenable number.

31541972136 is an abundant number, since it is smaller than the sum of its proper divisors (47321516664).

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

31541972136 is a wasteful number, since it uses less digits than its factorization.

31541972136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142649 (or 142645 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The spelling of 31541972136 in words is "thirty-one billion, five hundred forty-one million, nine hundred seventy-two thousand, one hundred thirty-six".