31999137007 has 2 divisors, whose sum is σ = 31999137008. Its totient is φ = 31999137006.

The previous prime is 31999136977. The next prime is 31999137013. The reversal of 31999137007 is 70073199913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31999137007 - 2⁷ = 31999136879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31999137047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15999568503 + 15999568504.

It is an arithmetic number, because the mean of its divisors is an integer number (15999568504).

Almost surely, 2^31999137007 is an apocalyptic number.

31999137007 is a deficient number, since it is larger than the sum of its proper divisors (1).

31999137007 is an equidigital number, since it uses as much as digits as its factorization.

31999137007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 321489, while the sum is 49.

The spelling of 31999137007 in words is "thirty-one billion, nine hundred ninety-nine million, one hundred thirty-seven thousand, seven".