31131213113 has 48 divisors (see below), whose sum is σ = 42171886848. Its totient is φ = 22361961600.

The previous prime is 31131213109. The next prime is 31131213149.

31131213113 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31131213113 - 2² = 31131213109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31131213313) 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, 11152748 + ... + 11155538.

It is an arithmetic number, because the mean of its divisors is an integer number (878580976).

Almost surely, 2^31131213113 is an apocalyptic number.

It is an amenable number.

31131213113 is a deficient number, since it is larger than the sum of its proper divisors (11040673735).

31131213113 is a wasteful number, since it uses less digits than its factorization.

31131213113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846 (or 3835 counting only the distinct ones).

The product of its digits is 162, while the sum is 20.

The spelling of 31131213113 in words is "thirty-one billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred thirteen".