19991814119 has 2 divisors, whose sum is σ = 19991814120. Its totient is φ = 19991814118.

The previous prime is 19991814083. The next prime is 19991814127. The reversal of 19991814119 is 91141819991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19991814119 - 2²⁸ = 19723378663 is a prime.

It is a super-2 number, since 2×19991814119² (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 (19993814119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9995907059 + 9995907060.

It is an arithmetic number, because the mean of its divisors is an integer number (9995907060).

Almost surely, 2^19991814119 is an apocalyptic number.

19991814119 is a deficient number, since it is larger than the sum of its proper divisors (1).

19991814119 is an equidigital number, since it uses as much as digits as its factorization.

19991814119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 53.

The spelling of 19991814119 in words is "nineteen billion, nine hundred ninety-one million, eight hundred fourteen thousand, one hundred nineteen".