31331013313 has 4 divisors (see below), whose sum is σ = 31409933140. Its totient is φ = 31252093488.

The previous prime is 31331013271. The next prime is 31331013317.

31331013313 is nontrivially palindromic in base 10.

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 19928404224 + 11402609089 = 141168^2 + 106783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31331013313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31331013317) 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, 39459318 + ... + 39460111.

It is an arithmetic number, because the mean of its divisors is an integer number (7852483285).

Almost surely, 2^31331013313 is an apocalyptic number.

It is an amenable number.

31331013313 is a deficient number, since it is larger than the sum of its proper divisors (78919827).

31331013313 is an equidigital number, since it uses as much as digits as its factorization.

31331013313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78919826.

The product of its (nonzero) digits is 729, while the sum is 22.

It can be divided in two parts, 313310 and 13313, that added together give a palindrome (326623).

The spelling of 31331013313 in words is "thirty-one billion, three hundred thirty-one million, thirteen thousand, three hundred thirteen".