22891091 has 4 divisors (see below), whose sum is σ = 22926384. Its totient is φ = 22855800.

The previous prime is 22891081. The next prime is 22891097. The reversal of 22891091 is 19019822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19019822 = 2 ⋅9509911.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22891091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22891097) 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, 16655 + ... + 17976.

It is an arithmetic number, because the mean of its divisors is an integer number (5731596).

Almost surely, 2^22891091 is an apocalyptic number.

22891091 is a deficient number, since it is larger than the sum of its proper divisors (35293).

22891091 is an equidigital number, since it uses as much as digits as its factorization.

22891091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35292.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 22891091 is about 4784.4635017941. The cubic root of 22891091 is about 283.9371141263.

It can be divided in two parts, 228 and 91091, that added together give a palindrome (91319).

The spelling of 22891091 in words is "twenty-two million, eight hundred ninety-one thousand, ninety-one".