31195495613 has 2 divisors, whose sum is σ = 31195495614. Its totient is φ = 31195495612.

The previous prime is 31195495609. The next prime is 31195495633. The reversal of 31195495613 is 31659459113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27416074084 + 3779421529 = 165578^2 + 61477^2 .

It is a cyclic number.

It is not a de Polignac number, because 31195495613 - 2² = 31195495609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31195495633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15597747806 + 15597747807.

It is an arithmetic number, because the mean of its divisors is an integer number (15597747807).

Almost surely, 2^31195495613 is an apocalyptic number.

It is an amenable number.

31195495613 is a deficient number, since it is larger than the sum of its proper divisors (1).

31195495613 is an equidigital number, since it uses as much as digits as its factorization.

31195495613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 437400, while the sum is 47.

The spelling of 31195495613 in words is "thirty-one billion, one hundred ninety-five million, four hundred ninety-five thousand, six hundred thirteen".