22638591 has 12 divisors (see below), whose sum is σ = 32752720. Its totient is φ = 15068160.

The previous prime is 22638571. The next prime is 22638593. The reversal of 22638591 is 19583622.

22638591 is a `hidden beast` number, since 2 + 2 + 63 + 8 + 591 = 666.

It is not a de Polignac number, because 22638591 - 2¹⁵ = 22605823 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 (22638593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5286 + ... + 8556.

Almost surely, 2^22638591 is an apocalyptic number.

22638591 is a deficient number, since it is larger than the sum of its proper divisors (10114129).

22638591 is a wasteful number, since it uses less digits than its factorization.

22638591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4046 (or 4043 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 22638591 is about 4758.0028373258. The cubic root of 22638591 is about 282.8892631546.

The spelling of 22638591 in words is "twenty-two million, six hundred thirty-eight thousand, five hundred ninety-one".