22481 has 2 divisors, whose sum is σ = 22482. Its totient is φ = 22480.

The previous prime is 22469. The next prime is 22483. The reversal of 22481 is 18422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13456 + 9025 = 116^2 + 95^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22481 is a prime.

It is a super-2 number, since 2×22481² = 1010790722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 22483, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 22481.

It is not a weakly prime, because it can be changed into another prime (22483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11240 + 11241.

It is an arithmetic number, because the mean of its divisors is an integer number (11241).

2²²⁴⁸¹ is an apocalyptic number.

It is an amenable number.

22481 is a deficient number, since it is larger than the sum of its proper divisors (1).

22481 is an equidigital number, since it uses as much as digits as its factorization.

22481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 17.

The square root of 22481 is about 149.9366532906. The cubic root of 22481 is about 28.2231321021.

The spelling of 22481 in words is "twenty-two thousand, four hundred eighty-one".