19191092091 has 8 divisors (see below), whose sum is σ = 25896413760. Its totient is φ = 12639915912.

The previous prime is 19191092083. The next prime is 19191092099. The reversal of 19191092091 is 19029019191.

It is an interprime number because it is at equal distance from previous prime (19191092083) and next prime (19191092099).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19191092091 - 2³ = 19191092083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19191092099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38536081 + ... + 38536578.

It is an arithmetic number, because the mean of its divisors is an integer number (3237051720).

Almost surely, 2^19191092091 is an apocalyptic number.

19191092091 is a deficient number, since it is larger than the sum of its proper divisors (6705321669).

19191092091 is an equidigital number, since it uses as much as digits as its factorization.

19191092091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77072745.

The product of its (nonzero) digits is 13122, while the sum is 42.

The spelling of 19191092091 in words is "nineteen billion, one hundred ninety-one million, ninety-two thousand, ninety-one".