19109979115 has 4 divisors (see below), whose sum is σ = 22931974944. Its totient is φ = 15287983288.

The previous prime is 19109979107. The next prime is 19109979121. The reversal of 19109979115 is 51197990191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51197990191 = 7499 ⋅6827309.

It is a cyclic number.

It is not a de Polignac number, because 19109979115 - 2³ = 19109979107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910997907 + ... + 1910997916.

It is an arithmetic number, because the mean of its divisors is an integer number (5732993736).

Almost surely, 2^19109979115 is an apocalyptic number.

19109979115 is a deficient number, since it is larger than the sum of its proper divisors (3821995829).

19109979115 is an equidigital number, since it uses as much as digits as its factorization.

19109979115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821995828.

The product of its (nonzero) digits is 229635, while the sum is 52.

The spelling of 19109979115 in words is "nineteen billion, one hundred nine million, nine hundred seventy-nine thousand, one hundred fifteen".