22523581 has 2 divisors, whose sum is σ = 22523582. Its totient is φ = 22523580.

The previous prime is 22523551. The next prime is 22523587. The reversal of 22523581 is 18532522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11902500 + 10621081 = 3450^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 22523581 - 2⁵ = 22523549 is a prime.

It is a super-2 number, since 2×22523581² = 1014623402127122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22523587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11261790 + 11261791.

It is an arithmetic number, because the mean of its divisors is an integer number (11261791).

Almost surely, 2^22523581 is an apocalyptic number.

It is an amenable number.

22523581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22523581 is an equidigital number, since it uses as much as digits as its factorization.

22523581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 28.

The square root of 22523581 is about 4745.9014949744. The cubic root of 22523581 is about 282.4093989882.

It can be divided in two parts, 22523 and 581, that added together give a square (23104 = 152²).

The spelling of 22523581 in words is "twenty-two million, five hundred twenty-three thousand, five hundred eighty-one".