31613961593 has 2 divisors, whose sum is σ = 31613961594. Its totient is φ = 31613961592.

The previous prime is 31613961559. The next prime is 31613961601. The reversal of 31613961593 is 39516931613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17623093504 + 13990868089 = 132752^2 + 118283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31613961593 is a prime.

It is not a weakly prime, because it can be changed into another prime (31613961793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806980796 + 15806980797.

It is an arithmetic number, because the mean of its divisors is an integer number (15806980797).

Almost surely, 2^31613961593 is an apocalyptic number.

It is an amenable number.

31613961593 is a deficient number, since it is larger than the sum of its proper divisors (1).

31613961593 is an equidigital number, since it uses as much as digits as its factorization.

31613961593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 47.

The spelling of 31613961593 in words is "thirty-one billion, six hundred thirteen million, nine hundred sixty-one thousand, five hundred ninety-three".