22431 has 4 divisors (see below), whose sum is σ = 29912. Its totient is φ = 14952.

The previous prime is 22409. The next prime is 22433. The reversal of 22431 is 13422.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22431 - 2⁶ = 22367 is a prime.

It is a super-2 number, since 2×22431² = 1006299522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

22431 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3736 + ... + 3741.

It is an arithmetic number, because the mean of its divisors is an integer number (7478).

2²²⁴³¹ is an apocalyptic number.

22431 is a deficient number, since it is larger than the sum of its proper divisors (7481).

22431 is an equidigital number, since it uses as much as digits as its factorization.

22431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480.

The product of its digits is 48, while the sum is 12.

The square root of 22431 is about 149.7698233958. The cubic root of 22431 is about 28.2021928781.

Adding to 22431 its reverse (13422), we get a palindrome (35853).

Subtracting from 22431 its reverse (13422), we obtain a palindrome (9009).

The spelling of 22431 in words is "twenty-two thousand, four hundred thirty-one".