22543 has 2 divisors, whose sum is σ = 22544. Its totient is φ = 22542.

The previous prime is 22541. The next prime is 22549. The reversal of 22543 is 34522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22543 - 2¹ = 22541 is a prime.

Together with 22541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11271 + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (11272).

2²²⁵⁴³ is an apocalyptic number.

22543 is a deficient number, since it is larger than the sum of its proper divisors (1).

22543 is an equidigital number, since it uses as much as digits as its factorization.

22543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 16.

The square root of 22543 is about 150.1432649172. The cubic root of 22543 is about 28.2490536661.

It can be divided in two parts, 22 and 543, that added together give a palindrome (565).

The spelling of 22543 in words is "twenty-two thousand, five hundred forty-three".