31513500037 has 2 divisors, whose sum is σ = 31513500038. Its totient is φ = 31513500036.

The previous prime is 31513499987. The next prime is 31513500061. The reversal of 31513500037 is 73000531513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30639351681 + 874148356 = 175041^2 + 29566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31513500037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31513499978 and 31513500014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31513500097) 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 as a sum of consecutive naturals, namely, 15756750018 + 15756750019.

It is an arithmetic number, because the mean of its divisors is an integer number (15756750019).

Almost surely, 2^31513500037 is an apocalyptic number.

It is an amenable number.

31513500037 is a deficient number, since it is larger than the sum of its proper divisors (1).

31513500037 is an equidigital number, since it uses as much as digits as its factorization.

31513500037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4725, while the sum is 28.

The spelling of 31513500037 in words is "thirty-one billion, five hundred thirteen million, five hundred thousand, thirty-seven".