22658561 has 2 divisors, whose sum is σ = 22658562. Its totient is φ = 22658560.

The previous prime is 22658557. The next prime is 22658563. The reversal of 22658561 is 16585622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 961 = 4760^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 22658561 - 2² = 22658557 is a prime.

Together with 22658563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22658563) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11329280 + 11329281.

It is an arithmetic number, because the mean of its divisors is an integer number (11329281).

Almost surely, 2^22658561 is an apocalyptic number.

It is an amenable number.

22658561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22658561 is an equidigital number, since it uses as much as digits as its factorization.

22658561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 22658561 is about 4760.1009443078. The cubic root of 22658561 is about 282.9724196590.

The spelling of 22658561 in words is "twenty-two million, six hundred fifty-eight thousand, five hundred sixty-one".