309812631013 has 2 divisors, whose sum is σ = 309812631014. Its totient is φ = 309812631012.

The previous prime is 309812630951. The next prime is 309812631041. The reversal of 309812631013 is 310136218903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204708287809 + 105104343204 = 452447^2 + 324198^2 .

It is a cyclic number.

It is not a de Polignac number, because 309812631013 - 2³³ = 301222696421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309812331013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154906315506 + 154906315507.

It is an arithmetic number, because the mean of its divisors is an integer number (154906315507).

Almost surely, 2^309812631013 is an apocalyptic number.

It is an amenable number.

309812631013 is a deficient number, since it is larger than the sum of its proper divisors (1).

309812631013 is an equidigital number, since it uses as much as digits as its factorization.

309812631013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

Adding to 309812631013 its reverse (310136218903), we get a palindrome (619948849916).

The spelling of 309812631013 in words is "three hundred nine billion, eight hundred twelve million, six hundred thirty-one thousand, thirteen".