19992191719 has 2 divisors, whose sum is σ = 19992191720. Its totient is φ = 19992191718.

The previous prime is 19992191711. The next prime is 19992191773. The reversal of 19992191719 is 91719129991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19992191719 - 2³ = 19992191711 is a prime.

It is a super-2 number, since 2×19992191719² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19992191711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996095859 + 9996095860.

It is an arithmetic number, because the mean of its divisors is an integer number (9996095860).

Almost surely, 2^19992191719 is an apocalyptic number.

19992191719 is a deficient number, since it is larger than the sum of its proper divisors (1).

19992191719 is an equidigital number, since it uses as much as digits as its factorization.

19992191719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 58.

The spelling of 19992191719 in words is "nineteen billion, nine hundred ninety-two million, one hundred ninety-one thousand, seven hundred nineteen".