31555966313 has 2 divisors, whose sum is σ = 31555966314. Its totient is φ = 31555966312.

The previous prime is 31555966229. The next prime is 31555966339. The reversal of 31555966313 is 31366955513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31156486144 + 399480169 = 176512^2 + 19987^2 .

It is a cyclic number.

It is not a de Polignac number, because 31555966313 - 2¹⁰ = 31555965289 is a prime.

It is not a weakly prime, because it can be changed into another prime (31555966513) 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, 15777983156 + 15777983157.

It is an arithmetic number, because the mean of its divisors is an integer number (15777983157).

Almost surely, 2^31555966313 is an apocalyptic number.

It is an amenable number.

31555966313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31555966313 is an equidigital number, since it uses as much as digits as its factorization.

31555966313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1093500, while the sum is 47.

The spelling of 31555966313 in words is "thirty-one billion, five hundred fifty-five million, nine hundred sixty-six thousand, three hundred thirteen".