31917602993 has 2 divisors, whose sum is σ = 31917602994. Its totient is φ = 31917602992.

The previous prime is 31917602963. The next prime is 31917602999. The reversal of 31917602993 is 39920671913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25118446144 + 6799156849 = 158488^2 + 82457^2 .

It is a cyclic number.

It is not a de Polignac number, because 31917602993 - 2¹² = 31917598897 is a prime.

It is not a weakly prime, because it can be changed into another prime (31917602999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15958801496 + 15958801497.

It is an arithmetic number, because the mean of its divisors is an integer number (15958801497).

Almost surely, 2^31917602993 is an apocalyptic number.

It is an amenable number.

31917602993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31917602993 is an equidigital number, since it uses as much as digits as its factorization.

31917602993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 50.

The spelling of 31917602993 in words is "thirty-one billion, nine hundred seventeen million, six hundred two thousand, nine hundred ninety-three".