19090195091 has 6 divisors (see below), whose sum is σ = 20826167292. Its totient is φ = 17354306220.

The previous prime is 19090195057. The next prime is 19090195093. The reversal of 19090195091 is 19059109091.

It is a de Polignac number, because none of the positive numbers 2^k-19090195091 is a prime.

It is a super-2 number, since 2×19090195091² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19090195093) 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 5 ways as a sum of consecutive naturals, for example, 437420 + ... + 479078.

It is an arithmetic number, because the mean of its divisors is an integer number (3471027882).

Almost surely, 2^19090195091 is an apocalyptic number.

19090195091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19090195091 is a deficient number, since it is larger than the sum of its proper divisors (1735972201).

19090195091 is an frugal number, since it uses more digits than its factorization.

19090195091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83329 (or 41670 counting only the distinct ones).

The product of its (nonzero) digits is 32805, while the sum is 44.

Multiplying 19090195091 by its sum of digits (44), we get a square (839968584004 = 916498²).

The spelling of 19090195091 in words is "nineteen billion, ninety million, one hundred ninety-five thousand, ninety-one".