22638631 has 4 divisors (see below), whose sum is σ = 23120352. Its totient is φ = 22156912.

The previous prime is 22638617. The next prime is 22638643. The reversal of 22638631 is 13683622.

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 22638631 - 2¹¹ = 22636583 is a prime.

It is a super-2 number, since 2×22638631² = 1025015227108322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22638593 and 22638602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22638331) 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, 240790 + ... + 240883.

It is an arithmetic number, because the mean of its divisors is an integer number (5780088).

Almost surely, 2^22638631 is an apocalyptic number.

22638631 is a deficient number, since it is larger than the sum of its proper divisors (481721).

22638631 is an equidigital number, since it uses as much as digits as its factorization.

22638631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481720.

The product of its digits is 10368, while the sum is 31.

The square root of 22638631 is about 4758.0070407682. The cubic root of 22638631 is about 282.8894297663.

The spelling of 22638631 in words is "twenty-two million, six hundred thirty-eight thousand, six hundred thirty-one".