31513315651 has 2 divisors, whose sum is σ = 31513315652. Its totient is φ = 31513315650.

The previous prime is 31513315649. The next prime is 31513315661. The reversal of 31513315651 is 15651331513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31513315651 - 2¹ = 31513315649 is a prime.

Together with 31513315649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31513315661) 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 as a sum of consecutive naturals, namely, 15756657825 + 15756657826.

It is an arithmetic number, because the mean of its divisors is an integer number (15756657826).

Almost surely, 2^31513315651 is an apocalyptic number.

31513315651 is a deficient number, since it is larger than the sum of its proper divisors (1).

31513315651 is an equidigital number, since it uses as much as digits as its factorization.

31513315651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20250, while the sum is 34.

The spelling of 31513315651 in words is "thirty-one billion, five hundred thirteen million, three hundred fifteen thousand, six hundred fifty-one".