22436581 has 2 divisors, whose sum is σ = 22436582. Its totient is φ = 22436580.

The previous prime is 22436573. The next prime is 22436597. The reversal of 22436581 is 18563422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 1779556 = 4545^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 22436581 - 2³ = 22436573 is a prime.

It is a super-2 number, since 2×22436581² = 1006800333939122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22436521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11218290 + 11218291.

It is an arithmetic number, because the mean of its divisors is an integer number (11218291).

Almost surely, 2^22436581 is an apocalyptic number.

It is an amenable number.

22436581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22436581 is an equidigital number, since it uses as much as digits as its factorization.

22436581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 22436581 is about 4736.7268234510. The cubic root of 22436581 is about 282.0453165609.

The spelling of 22436581 in words is "twenty-two million, four hundred thirty-six thousand, five hundred eighty-one".