31311321312331 has 16 divisors (see below), whose sum is σ = 31476473915040. Its totient is φ = 31146597861120.

The previous prime is 31311321312281. The next prime is 31311321312367. The reversal of 31311321312331 is 13321312311313.

It is a happy number.

It is not a de Polignac number, because 31311321312331 - 2¹⁹ = 31311320788043 is a prime.

It is a super-2 number, since 2×31311321312331² (a number of 28 digits) contains 22 as substring.

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 31311321312331.

It is not an unprimeable number, because it can be changed into a prime (31311321312391) 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, 1427838975 + ... + 1427860903.

It is an arithmetic number, because the mean of its divisors is an integer number (1967279619690).

Almost surely, 2^{31311321312331} is an apocalyptic number.

31311321312331 is a deficient number, since it is larger than the sum of its proper divisors (165152602709).

31311321312331 is a wasteful number, since it uses less digits than its factorization.

31311321312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31374.

The product of its digits is 2916, while the sum is 28.

Adding to 31311321312331 its reverse (13321312311313), we get a palindrome (44632633623644).

The spelling of 31311321312331 in words is "thirty-one trillion, three hundred eleven billion, three hundred twenty-one million, three hundred twelve thousand, three hundred thirty-one".