190911091 has 4 divisors (see below), whose sum is σ = 218184112. Its totient is φ = 163638072.

The previous prime is 190911059. The next prime is 190911101. The reversal of 190911091 is 190119091.

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 190911091 - 2⁵ = 190911059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190911011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13636500 + ... + 13636513.

It is an arithmetic number, because the mean of its divisors is an integer number (54546028).

Almost surely, 2^190911091 is an apocalyptic number.

190911091 is a deficient number, since it is larger than the sum of its proper divisors (27273021).

190911091 is an equidigital number, since it uses as much as digits as its factorization.

190911091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27273020.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 190911091 is about 13817.0579719418. The cubic root of 190911091 is about 575.8071497443.

The spelling of 190911091 in words is "one hundred ninety million, nine hundred eleven thousand, ninety-one".