19713897019 has 2 divisors, whose sum is σ = 19713897020. Its totient is φ = 19713897018.

The previous prime is 19713896989. The next prime is 19713897031. The reversal of 19713897019 is 91079831791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19713897019 - 2⁵ = 19713896987 is a prime.

It is a super-2 number, since 2×19713897019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19713897419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856948509 + 9856948510.

It is an arithmetic number, because the mean of its divisors is an integer number (9856948510).

Almost surely, 2^19713897019 is an apocalyptic number.

19713897019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713897019 is an equidigital number, since it uses as much as digits as its factorization.

19713897019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 55.

The spelling of 19713897019 in words is "nineteen billion, seven hundred thirteen million, eight hundred ninety-seven thousand, nineteen".