19117428523 has 16 divisors (see below), whose sum is σ = 20861850240. Its totient is φ = 17447907456.

The previous prime is 19117428503. The next prime is 19117428527. The reversal of 19117428523 is 32582471191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19117428523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19117428523.

It is not an unprimeable number, because it can be changed into a prime (19117428527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7536 + ... + 195682.

It is an arithmetic number, because the mean of its divisors is an integer number (1303865640).

Almost surely, 2^19117428523 is an apocalyptic number.

19117428523 is a deficient number, since it is larger than the sum of its proper divisors (1744421717).

19117428523 is a wasteful number, since it uses less digits than its factorization.

19117428523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188346.

The product of its digits is 120960, while the sum is 43.

The spelling of 19117428523 in words is "nineteen billion, one hundred seventeen million, four hundred twenty-eight thousand, five hundred twenty-three".