31431479556 has 12 divisors (see below), whose sum is σ = 73340118992. Its totient is φ = 10477159848.

The previous prime is 31431479533. The next prime is 31431479561. The reversal of 31431479556 is 65597413413.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309644970 + ... + 1309644993.

Almost surely, 2^31431479556 is an apocalyptic number.

It is an amenable number.

31431479556 is an abundant number, since it is smaller than the sum of its proper divisors (41908639436).

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

31431479556 is a wasteful number, since it uses less digits than its factorization.

31431479556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619289970 (or 2619289968 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 48.

The spelling of 31431479556 in words is "thirty-one billion, four hundred thirty-one million, four hundred seventy-nine thousand, five hundred fifty-six".