22989991 has 4 divisors (see below), whose sum is σ = 23042800. Its totient is φ = 22937184.

The previous prime is 22989983. The next prime is 22990007. The reversal of 22989991 is 19998922.

It is a happy number.

22989991 is nontrivially palindromic in base 12.

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 22989991 - 2³ = 22989983 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 (22989961) 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, 25746 + ... + 26623.

It is an arithmetic number, because the mean of its divisors is an integer number (5760700).

Almost surely, 2^22989991 is an apocalyptic number.

22989991 is a deficient number, since it is larger than the sum of its proper divisors (52809).

22989991 is an equidigital number, since it uses as much as digits as its factorization.

22989991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52808.

The product of its digits is 209952, while the sum is 49.

The square root of 22989991 is about 4794.7878993757. The cubic root of 22989991 is about 284.3454394423.

The spelling of 22989991 in words is "twenty-two million, nine hundred eighty-nine thousand, nine hundred ninety-one".