22591 has 8 divisors (see below), whose sum is σ = 25200. Its totient is φ = 20160.

The previous prime is 22573. The next prime is 22613. The reversal of 22591 is 19522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22591 - 2⁹ = 22079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

22591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (3150).

2²²⁵⁹¹ is an apocalyptic number.

22591 is a deficient number, since it is larger than the sum of its proper divisors (2609).

22591 is a wasteful number, since it uses less digits than its factorization.

22591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89.

The product of its digits is 180, while the sum is 19.

The square root of 22591 is about 150.3030272483. The cubic root of 22591 is about 28.2690893507.

The spelling of 22591 in words is "twenty-two thousand, five hundred ninety-one".