31131662356 has 6 divisors (see below), whose sum is σ = 54480409130. Its totient is φ = 15565831176.

The previous prime is 31131662333. The next prime is 31131662389. The reversal of 31131662356 is 65326613113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16930173456 + 14201488900 = 130116^2 + 119170^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3891457791 + ... + 3891457798.

Almost surely, 2^31131662356 is an apocalyptic number.

It is an amenable number.

31131662356 is a deficient number, since it is larger than the sum of its proper divisors (23348746774).

31131662356 is a wasteful number, since it uses less digits than its factorization.

31131662356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782915593 (or 7782915591 counting only the distinct ones).

The product of its digits is 58320, while the sum is 37.

The spelling of 31131662356 in words is "thirty-one billion, one hundred thirty-one million, six hundred sixty-two thousand, three hundred fifty-six".