19109251338 has 32 divisors (see below), whose sum is σ = 38603174400. Its totient is φ = 6305723760.

The previous prime is 19109251333. The next prime is 19109251433. The reversal of 19109251338 is 83315290191.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19109251338.

It is not an unprimeable number, because it can be changed into a prime (19109251331) 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, 960213 + ... + 979911.

It is an arithmetic number, because the mean of its divisors is an integer number (1206349200).

Almost surely, 2^19109251338 is an apocalyptic number.

19109251338 is an abundant number, since it is smaller than the sum of its proper divisors (19493923062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19109251338 is a wasteful number, since it uses less digits than its factorization.

19109251338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21322.

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 19109251338 in words is "nineteen billion, one hundred nine million, two hundred fifty-one thousand, three hundred thirty-eight".