31388090013 has 24 divisors (see below), whose sum is σ = 51927219968. Its totient is φ = 17897296032.

The previous prime is 31388089987. The next prime is 31388090047. The reversal of 31388090013 is 31009088313.

It is not a de Polignac number, because 31388090013 - 2⁹ = 31388089501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31388090013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31388090113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 508870 + ... + 567207.

Almost surely, 2^31388090013 is an apocalyptic number.

It is an amenable number.

31388090013 is a deficient number, since it is larger than the sum of its proper divisors (20539129955).

31388090013 is a wasteful number, since it uses less digits than its factorization.

31388090013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076553 (or 1076550 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 31388090013 in words is "thirty-one billion, three hundred eighty-eight million, ninety thousand, thirteen".