31311312113 has 16 divisors (see below), whose sum is σ = 33398787024. Its totient is φ = 29251522560.

The previous prime is 31311312103. The next prime is 31311312119. The reversal of 31311312113 is 31121311313.

It can be written as a sum of positive squares in 8 ways, for example, as 69689104 + 31241623009 = 8348^2 + 176753^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311312113 - 2³⁰ = 30237570289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311312119) 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, 2826281 + ... + 2837337.

It is an arithmetic number, because the mean of its divisors is an integer number (2087424189).

Almost surely, 2^31311312113 is an apocalyptic number.

It is an amenable number.

31311312113 is a deficient number, since it is larger than the sum of its proper divisors (2087474911).

31311312113 is a wasteful number, since it uses less digits than its factorization.

31311312113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12292.

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

Adding to 31311312113 its reverse (31121311313), we get a palindrome (62432623426).

The spelling of 31311312113 in words is "thirty-one billion, three hundred eleven million, three hundred twelve thousand, one hundred thirteen".