31313023131 has 32 divisors (see below), whose sum is σ = 47345760000. Its totient is φ = 18248796288.

The previous prime is 31313023127. The next prime is 31313023153. The reversal of 31313023131 is 13132031313.

It is not a de Polignac number, because 31313023131 - 2² = 31313023127 is a prime.

It is a super-2 number, since 2×31313023131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31313023098 and 31313023107.

It is not an unprimeable number, because it can be changed into a prime (31313023531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2705545 + ... + 2717093.

It is an arithmetic number, because the mean of its divisors is an integer number (1479555000).

Almost surely, 2^31313023131 is an apocalyptic number.

31313023131 is a deficient number, since it is larger than the sum of its proper divisors (16032736869).

31313023131 is a wasteful number, since it uses less digits than its factorization.

31313023131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15243.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31313023131 its reverse (13132031313), we get a palindrome (44445054444).

The spelling of 31313023131 in words is "thirty-one billion, three hundred thirteen million, twenty-three thousand, one hundred thirty-one".