31331130232013 has 4 divisors (see below), whose sum is σ = 31331146149408. Its totient is φ = 31331114314620.

The previous prime is 31331130232009. The next prime is 31331130232027. The reversal of 31331130232013 is 31023203113313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31331130232013 - 2² = 31331130232009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331130232043) 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, 4507223 + ... + 9109188.

It is an arithmetic number, because the mean of its divisors is an integer number (7832786537352).

Almost surely, 2^{31331130232013} is an apocalyptic number.

It is an amenable number.

31331130232013 is a deficient number, since it is larger than the sum of its proper divisors (15917395).

31331130232013 is a wasteful number, since it uses less digits than its factorization.

31331130232013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15917394.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 31331130232013 its reverse (31023203113313), we get a palindrome (62354333345326).

The spelling of 31331130232013 in words is "thirty-one trillion, three hundred thirty-one billion, one hundred thirty million, two hundred thirty-two thousand, thirteen".