31246920013 has 2 divisors, whose sum is σ = 31246920014. Its totient is φ = 31246920012.

The previous prime is 31246919993. The next prime is 31246920059. The reversal of 31246920013 is 31002964213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23074217604 + 8172702409 = 151902^2 + 90403^2 .

It is a cyclic number.

It is not a de Polignac number, because 31246920013 - 2²⁵ = 31213365581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31246920413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15623460006 + 15623460007.

It is an arithmetic number, because the mean of its divisors is an integer number (15623460007).

Almost surely, 2^31246920013 is an apocalyptic number.

It is an amenable number.

31246920013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31246920013 is an equidigital number, since it uses as much as digits as its factorization.

31246920013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 31246920013 in words is "thirty-one billion, two hundred forty-six million, nine hundred twenty thousand, thirteen".