31315851313 has 4 divisors (see below), whose sum is σ = 31473217600. Its totient is φ = 31158485028.

The previous prime is 31315851311. The next prime is 31315851341.

31315851313 is nontrivially palindromic in base 10.

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 31315851313 - 2¹ = 31315851311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31315851311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78682845 + ... + 78683242.

It is an arithmetic number, because the mean of its divisors is an integer number (7868304400).

Almost surely, 2^31315851313 is an apocalyptic number.

It is an amenable number.

31315851313 is a deficient number, since it is larger than the sum of its proper divisors (157366287).

31315851313 is a wasteful number, since it uses less digits than its factorization.

31315851313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157366286.

The product of its digits is 16200, while the sum is 34.

The spelling of 31315851313 in words is "thirty-one billion, three hundred fifteen million, eight hundred fifty-one thousand, three hundred thirteen".