31313012131 has 4 divisors (see below), whose sum is σ = 32392771200. Its totient is φ = 30233253064.

The previous prime is 31313012117. The next prime is 31313012161. The reversal of 31313012131 is 13121031313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313012131 is a prime.

It is a super-2 number, since 2×31313012131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313012099 and 31313012108.

It is not an unprimeable number, because it can be changed into a prime (31313012161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539879491 + ... + 539879548.

It is an arithmetic number, because the mean of its divisors is an integer number (8098192800).

Almost surely, 2^31313012131 is an apocalyptic number.

31313012131 is a deficient number, since it is larger than the sum of its proper divisors (1079759069).

31313012131 is a wasteful number, since it uses less digits than its factorization.

31313012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079759068.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31313012131 its reverse (13121031313), we get a palindrome (44434043444).

The spelling of 31313012131 in words is "thirty-one billion, three hundred thirteen million, twelve thousand, one hundred thirty-one".