19117398893 has 4 divisors (see below), whose sum is σ = 19136346780. Its totient is φ = 19098451008.

The previous prime is 19117398887. The next prime is 19117398901. The reversal of 19117398893 is 39889371191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39889371191 = 19 ⋅2099440589.

It can be written as a sum of positive squares in 2 ways, for example, as 8234110564 + 10883288329 = 90742^2 + 104323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19117398893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19117308893) 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, 9472430 + ... + 9474447.

It is an arithmetic number, because the mean of its divisors is an integer number (4784086695).

Almost surely, 2^19117398893 is an apocalyptic number.

It is an amenable number.

19117398893 is a deficient number, since it is larger than the sum of its proper divisors (18947887).

19117398893 is a wasteful number, since it uses less digits than its factorization.

19117398893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18947886.

The product of its digits is 2939328, while the sum is 59.

The spelling of 19117398893 in words is "nineteen billion, one hundred seventeen million, three hundred ninety-eight thousand, eight hundred ninety-three".