31645139316 has 24 divisors (see below), whose sum is σ = 84387038400. Its totient is φ = 9041468352.

The previous prime is 31645139303. The next prime is 31645139327. The reversal of 31645139316 is 61393154613.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188363841 + ... + 188364008.

It is an arithmetic number, because the mean of its divisors is an integer number (3516126600).

Almost surely, 2^31645139316 is an apocalyptic number.

It is an amenable number.

31645139316 is an abundant number, since it is smaller than the sum of its proper divisors (52741899084).

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

31645139316 is a wasteful number, since it uses less digits than its factorization.

31645139316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376727863 (or 376727861 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The spelling of 31645139316 in words is "thirty-one billion, six hundred forty-five million, one hundred thirty-nine thousand, three hundred sixteen".