22909231 has 4 divisors (see below), whose sum is σ = 24115000. Its totient is φ = 21703464.

The previous prime is 22909213. The next prime is 22909247. The reversal of 22909231 is 13290922.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13290922 = 2 ⋅6645461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22909231 is a prime.

It is a super-2 number, since 2×22909231² = 1049665730022722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22909231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22909291) 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, 602856 + ... + 602893.

It is an arithmetic number, because the mean of its divisors is an integer number (6028750).

Almost surely, 2^22909231 is an apocalyptic number.

22909231 is a deficient number, since it is larger than the sum of its proper divisors (1205769).

22909231 is a wasteful number, since it uses less digits than its factorization.

22909231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205768.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 22909231 is about 4786.3588457198. The cubic root of 22909231 is about 284.0120961257.

The spelling of 22909231 in words is "twenty-two million, nine hundred nine thousand, two hundred thirty-one".