31311210010031 has 12 divisors (see below), whose sum is σ = 38565788080608. Its totient is φ = 25259463536832.

The previous prime is 31311210009967. The next prime is 31311210010033. The reversal of 31311210010031 is 13001001211313.

It is not a de Polignac number, because 31311210010031 - 2⁶ = 31311210009967 is a prime.

It is a super-2 number, since 2×31311210010031² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311210009991 and 31311210010009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311210010033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18794242871 + ... + 18794244536.

It is an arithmetic number, because the mean of its divisors is an integer number (3213815673384).

Almost surely, 2^{31311210010031} is an apocalyptic number.

31311210010031 is a deficient number, since it is larger than the sum of its proper divisors (7254578070577).

31311210010031 is a wasteful number, since it uses less digits than its factorization.

31311210010031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37588487438 (or 37588487431 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31311210010031 its reverse (13001001211313), we get a palindrome (44312211221344).

The spelling of 31311210010031 in words is "thirty-one trillion, three hundred eleven billion, two hundred ten million, ten thousand, thirty-one".