19191092090 has 16 divisors (see below), whose sum is σ = 36575964072. Its totient is φ = 7224881664.

The previous prime is 19191092083. The next prime is 19191092099. The reversal of 19191092090 is 9029019191.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11434238761 + 7756853329 = 106931^2 + 88073^2 .

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, 56444219 + ... + 56444558.

Almost surely, 2^19191092090 is an apocalyptic number.

19191092090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19191092090 is a deficient number, since it is larger than the sum of its proper divisors (17384871982).

19191092090 is a wasteful number, since it uses less digits than its factorization.

19191092090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112888801.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 19191092090 in words is "nineteen billion, one hundred ninety-one million, ninety-two thousand, ninety".