31511475940056 has 128 divisors (see below), whose sum is σ = 95335192442880. Its totient is φ = 8473109078016.

The previous prime is 31511475940051. The next prime is 31511475940057. The reversal of 31511475940056 is 65004957411513.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 31511475939990 and 31511475940008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31511475940051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43373665 + ... + 44094191.

It is an arithmetic number, because the mean of its divisors is an integer number (744806190960).

Almost surely, 2^{31511475940056} is an apocalyptic number.

It is an amenable number.

31511475940056 is an abundant number, since it is smaller than the sum of its proper divisors (63823716502824).

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

31511475940056 is a wasteful number, since it uses less digits than its factorization.

31511475940056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735873 (or 735869 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 31511475940056 in words is "thirty-one trillion, five hundred eleven billion, four hundred seventy-five million, nine hundred forty thousand, fifty-six".