31531344313513 has 16 divisors (see below), whose sum is σ = 35895334237056. Its totient is φ = 27417073559040.

The previous prime is 31531344313481. The next prime is 31531344313519.

31531344313513 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31531344313513 - 2⁵ = 31531344313481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31531344313519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309081 + ... + 8048377.

It is an arithmetic number, because the mean of its divisors is an integer number (2243458389816).

Almost surely, 2^{31531344313513} is an apocalyptic number.

It is an amenable number.

31531344313513 is a deficient number, since it is larger than the sum of its proper divisors (4363989923543).

31531344313513 is a wasteful number, since it uses less digits than its factorization.

31531344313513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6757824.

The product of its digits is 291600, while the sum is 40.

It can be divided in two parts, 3153134 and 4313513, that added together give a palindrome (7466647).

The spelling of 31531344313513 in words is "thirty-one trillion, five hundred thirty-one billion, three hundred forty-four million, three hundred thirteen thousand, five hundred thirteen".