31131330113 has 4 divisors (see below), whose sum is σ = 33526047828. Its totient is φ = 28736612400.

The previous prime is 31131330107. The next prime is 31131330127. The reversal of 31131330113 is 31103313113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8044654864 + 23086675249 = 89692^2 + 151943^2 .

It is a cyclic number.

It is not a de Polignac number, because 31131330113 - 2²⁴ = 31114552897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31131330133) 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, 1197358838 + ... + 1197358863.

It is an arithmetic number, because the mean of its divisors is an integer number (8381511957).

Almost surely, 2^31131330113 is an apocalyptic number.

It is an amenable number.

31131330113 is a deficient number, since it is larger than the sum of its proper divisors (2394717715).

31131330113 is a wasteful number, since it uses less digits than its factorization.

31131330113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394717714.

The product of its (nonzero) digits is 243, while the sum is 20.

Adding to 31131330113 its reverse (31103313113), we get a palindrome (62234643226).

The spelling of 31131330113 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty thousand, one hundred thirteen".