31516012116131 has 4 divisors (see below), whose sum is σ = 31632307364064. Its totient is φ = 31399716868200.

The previous prime is 31516012116109. The next prime is 31516012116151. The reversal of 31516012116131 is 13161121061513.

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-31516012116131 is a prime.

It is a super-2 number, since 2×31516012116131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31516012116151) 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, 58147623560 + ... + 58147624101.

It is an arithmetic number, because the mean of its divisors is an integer number (7908076841016).

Almost surely, 2^{31516012116131} is an apocalyptic number.

31516012116131 is a deficient number, since it is larger than the sum of its proper divisors (116295247933).

31516012116131 is a wasteful number, since it uses less digits than its factorization.

31516012116131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116295247932.

The product of its (nonzero) digits is 3240, while the sum is 32.

Adding to 31516012116131 its reverse (13161121061513), we get a palindrome (44677133177644).

The spelling of 31516012116131 in words is "thirty-one trillion, five hundred sixteen billion, twelve million, one hundred sixteen thousand, one hundred thirty-one".