23090191 has 4 divisors (see below), whose sum is σ = 23266584. Its totient is φ = 22913800.

The previous prime is 23090167. The next prime is 23090201. The reversal of 23090191 is 19109032.

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 23090191 - 2⁵ = 23090159 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 (23090161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88000 + ... + 88261.

It is an arithmetic number, because the mean of its divisors is an integer number (5816646).

Almost surely, 2^23090191 is an apocalyptic number.

23090191 is a deficient number, since it is larger than the sum of its proper divisors (176393).

23090191 is a wasteful number, since it uses less digits than its factorization.

23090191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176392.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 23090191 is about 4805.2253849325. The cubic root of 23090191 is about 284.7579395381.

The spelling of 23090191 in words is "twenty-three million, ninety thousand, one hundred ninety-one".