31368431513 has 4 divisors (see below), whose sum is σ = 31370043600. Its totient is φ = 31366819428.

The previous prime is 31368431483. The next prime is 31368431519. The reversal of 31368431513 is 31513486313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31513486313 = 17 ⋅1853734489.

It is a cyclic number.

It is not a de Polignac number, because 31368431513 - 2²⁶ = 31301322649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31368431519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776495 + ... + 815892.

It is an arithmetic number, because the mean of its divisors is an integer number (7842510900).

Almost surely, 2^31368431513 is an apocalyptic number.

It is an amenable number.

31368431513 is a deficient number, since it is larger than the sum of its proper divisors (1612087).

31368431513 is a wasteful number, since it uses less digits than its factorization.

31368431513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612086.

The product of its digits is 77760, while the sum is 38.

The spelling of 31368431513 in words is "thirty-one billion, three hundred sixty-eight million, four hundred thirty-one thousand, five hundred thirteen".