22461581 has 2 divisors, whose sum is σ = 22461582. Its totient is φ = 22461580.

The previous prime is 22461541. The next prime is 22461587. The reversal of 22461581 is 18516422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16532356 + 5929225 = 4066^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 22461581 - 2¹⁴ = 22445197 is a prime.

It is a super-2 number, since 2×22461581² = 1009045242039122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22461587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11230790 + 11230791.

It is an arithmetic number, because the mean of its divisors is an integer number (11230791).

Almost surely, 2^22461581 is an apocalyptic number.

It is an amenable number.

22461581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22461581 is an equidigital number, since it uses as much as digits as its factorization.

22461581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 22461581 is about 4739.3650418595. The cubic root of 22461581 is about 282.1500341740.

The spelling of 22461581 in words is "twenty-two million, four hundred sixty-one thousand, five hundred eighty-one".