31313312120031 has 16 divisors (see below), whose sum is σ = 43948793187840. Its totient is φ = 19776700480320.

The previous prime is 31313312120017. The next prime is 31313312120039. The reversal of 31313312120031 is 13002121331313.

It is not a de Polignac number, because 31313312120031 - 2⁴² = 26915265608927 is a prime.

It is a super-2 number, since 2×31313312120031² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31313312119983 and 31313312120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313312120039) 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, 7508826 + ... + 10909128.

It is an arithmetic number, because the mean of its divisors is an integer number (2746799574240).

Almost surely, 2^{31313312120031} is an apocalyptic number.

31313312120031 is a deficient number, since it is larger than the sum of its proper divisors (12635481067809).

31313312120031 is a wasteful number, since it uses less digits than its factorization.

31313312120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561886.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 31313312120031 its reverse (13002121331313), we get a palindrome (44315433451344).

The spelling of 31313312120031 in words is "thirty-one trillion, three hundred thirteen billion, three hundred twelve million, one hundred twenty thousand, thirty-one".