19517319359 has 2 divisors, whose sum is σ = 19517319360. Its totient is φ = 19517319358.

The previous prime is 19517319307. The next prime is 19517319373. The reversal of 19517319359 is 95391371591.

It is a strong prime.

It is an emirp because it is prime and its reverse (95391371591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19517319359 - 2⁸ = 19517319103 is a prime.

It is a super-2 number, since 2×19517319359² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19517319359.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19517313359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9758659679 + 9758659680.

It is an arithmetic number, because the mean of its divisors is an integer number (9758659680).

Almost surely, 2^19517319359 is an apocalyptic number.

19517319359 is a deficient number, since it is larger than the sum of its proper divisors (1).

19517319359 is an equidigital number, since it uses as much as digits as its factorization.

19517319359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1148175, while the sum is 53.

The spelling of 19517319359 in words is "nineteen billion, five hundred seventeen million, three hundred nineteen thousand, three hundred fifty-nine".