19989504317 has 2 divisors, whose sum is σ = 19989504318. Its totient is φ = 19989504316.

The previous prime is 19989504253. The next prime is 19989504319. The reversal of 19989504317 is 71340598991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18820821721 + 1168682596 = 137189^2 + 34186^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989504317 - 2⁶ = 19989504253 is a prime.

Together with 19989504319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19989504319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994752158 + 9994752159.

It is an arithmetic number, because the mean of its divisors is an integer number (9994752159).

Almost surely, 2^19989504317 is an apocalyptic number.

It is an amenable number.

19989504317 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989504317 is an equidigital number, since it uses as much as digits as its factorization.

19989504317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 19989504317 in words is "nineteen billion, nine hundred eighty-nine million, five hundred four thousand, three hundred seventeen".