31699818193 has 2 divisors, whose sum is σ = 31699818194. Its totient is φ = 31699818192.

The previous prime is 31699818169. The next prime is 31699818233. The reversal of 31699818193 is 39181899613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28829323264 + 2870494929 = 169792^2 + 53577^2 .

It is an emirp because it is prime and its reverse (39181899613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31699818193 is a prime.

It is not a weakly prime, because it can be changed into another prime (31699818113) 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, 15849909096 + 15849909097.

It is an arithmetic number, because the mean of its divisors is an integer number (15849909097).

Almost surely, 2^31699818193 is an apocalyptic number.

It is an amenable number.

31699818193 is a deficient number, since it is larger than the sum of its proper divisors (1).

31699818193 is an equidigital number, since it uses as much as digits as its factorization.

31699818193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 58.

The spelling of 31699818193 in words is "thirty-one billion, six hundred ninety-nine million, eight hundred eighteen thousand, one hundred ninety-three".