31806885513 has 16 divisors (see below), whose sum is σ = 46314688896. Its totient is φ = 19297783680.

The previous prime is 31806885511. The next prime is 31806885529. The reversal of 31806885513 is 31558860813.

It is not a de Polignac number, because 31806885513 - 2¹ = 31806885511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31806885511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5740620 + ... + 5746157.

It is an arithmetic number, because the mean of its divisors is an integer number (2894668056).

Almost surely, 2^31806885513 is an apocalyptic number.

It is an amenable number.

31806885513 is a deficient number, since it is larger than the sum of its proper divisors (14507803383).

31806885513 is a wasteful number, since it uses less digits than its factorization.

31806885513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486864.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 31806885513 in words is "thirty-one billion, eight hundred six million, eight hundred eighty-five thousand, five hundred thirteen".