19983117317 has 2 divisors, whose sum is σ = 19983117318. Its totient is φ = 19983117316.

The previous prime is 19983117311. The next prime is 19983117383. The reversal of 19983117317 is 71371138991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17913413281 + 2069704036 = 133841^2 + 45494^2 .

It is a cyclic number.

It is not a de Polignac number, because 19983117317 - 2⁸ = 19983117061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19983117311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9991558658 + 9991558659.

It is an arithmetic number, because the mean of its divisors is an integer number (9991558659).

Almost surely, 2^19983117317 is an apocalyptic number.

It is an amenable number.

19983117317 is a deficient number, since it is larger than the sum of its proper divisors (1).

19983117317 is an equidigital number, since it uses as much as digits as its factorization.

19983117317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 50.

The spelling of 19983117317 in words is "nineteen billion, nine hundred eighty-three million, one hundred seventeen thousand, three hundred seventeen".