31806860813 has 48 divisors (see below), whose sum is σ = 40459104000. Its totient is φ = 24468687360.

The previous prime is 31806860809. The next prime is 31806860837.

31806860813 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31806860813 - 2² = 31806860809 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31806860803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16926608 + ... + 16928486.

It is an arithmetic number, because the mean of its divisors is an integer number (842898000).

Almost surely, 2^31806860813 is an apocalyptic number.

It is an amenable number.

31806860813 is a deficient number, since it is larger than the sum of its proper divisors (8652243187).

31806860813 is a wasteful number, since it uses less digits than its factorization.

31806860813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302 (or 2289 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 31806860813 in words is "thirty-one billion, eight hundred six million, eight hundred sixty thousand, eight hundred thirteen".