23211091 has 4 divisors (see below), whose sum is σ = 23704992. Its totient is φ = 22717192.

The previous prime is 23211077. The next prime is 23211101. The reversal of 23211091 is 19011232.

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 23211091 - 2⁵ = 23211059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23215091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246880 + ... + 246973.

It is an arithmetic number, because the mean of its divisors is an integer number (5926248).

Almost surely, 2^23211091 is an apocalyptic number.

23211091 is a deficient number, since it is larger than the sum of its proper divisors (493901).

23211091 is an equidigital number, since it uses as much as digits as its factorization.

23211091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493900.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 23211091 is about 4817.7890157208. The cubic root of 23211091 is about 285.2540711665.

The spelling of 23211091 in words is "twenty-three million, two hundred eleven thousand, ninety-one".