31535116131 has 4 divisors (see below), whose sum is σ = 42046821512. Its totient is φ = 21023410752.

The previous prime is 31535116097. The next prime is 31535116139. The reversal of 31535116131 is 13161153513.

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

It is not a de Polignac number, because 31535116131 - 2⁷ = 31535116003 is a prime.

It is a super-2 number, since 2×31535116131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31535116139) 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, 5255852686 + ... + 5255852691.

It is an arithmetic number, because the mean of its divisors is an integer number (10511705378).

Almost surely, 2^31535116131 is an apocalyptic number.

31535116131 is a deficient number, since it is larger than the sum of its proper divisors (10511705381).

31535116131 is a wasteful number, since it uses less digits than its factorization.

31535116131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511705380.

The product of its digits is 4050, while the sum is 30.

Adding to 31535116131 its reverse (13161153513), we get a palindrome (44696269644).

The spelling of 31535116131 in words is "thirty-one billion, five hundred thirty-five million, one hundred sixteen thousand, one hundred thirty-one".