19105794191 has 4 divisors (see below), whose sum is σ = 20842684584. Its totient is φ = 17368903800.

The previous prime is 19105794157. The next prime is 19105794193. The reversal of 19105794191 is 19149750191.

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

It is a cyclic number.

It is not a de Polignac number, because 19105794191 - 2²⁶ = 19038685327 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 (19105794193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868445180 + ... + 868445201.

It is an arithmetic number, because the mean of its divisors is an integer number (5210671146).

Almost surely, 2^19105794191 is an apocalyptic number.

19105794191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19105794191 is a deficient number, since it is larger than the sum of its proper divisors (1736890393).

19105794191 is a wasteful number, since it uses less digits than its factorization.

19105794191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736890392.

The product of its (nonzero) digits is 102060, while the sum is 47.

The spelling of 19105794191 in words is "nineteen billion, one hundred five million, seven hundred ninety-four thousand, one hundred ninety-one".