19119999 has 4 divisors (see below), whose sum is σ = 25493336. Its totient is φ = 12746664.

The previous prime is 19119979. The next prime is 19120001. The reversal of 19119999 is 99991191.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 19119999 - 2⁵ = 19119967 is a prime.

It is a Duffinian number.

19119999 is a modest number, since divided by 9999 gives 1911 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19119949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3186664 + ... + 3186669.

It is an arithmetic number, because the mean of its divisors is an integer number (6373334).

Almost surely, 2^19119999 is an apocalyptic number.

19119999 is a deficient number, since it is larger than the sum of its proper divisors (6373337).

19119999 is an equidigital number, since it uses as much as digits as its factorization.

19119999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6373336.

The product of its digits is 59049, while the sum is 48.

The square root of 19119999 is about 4372.6421074677. The cubic root of 19119999 is about 267.4007504398.

The spelling of 19119999 in words is "nineteen million, one hundred nineteen thousand, nine hundred ninety-nine".