22539661 has 2 divisors, whose sum is σ = 22539662. Its totient is φ = 22539660.

The previous prime is 22539631. The next prime is 22539679. The reversal of 22539661 is 16693522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 1425636 = 4595^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 22539661 - 2⁷ = 22539533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22539631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11269830 + 11269831.

It is an arithmetic number, because the mean of its divisors is an integer number (11269831).

Almost surely, 2^22539661 is an apocalyptic number.

It is an amenable number.

22539661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22539661 is an equidigital number, since it uses as much as digits as its factorization.

22539661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 22539661 is about 4747.5952860369. The cubic root of 22539661 is about 282.4765887614.

The spelling of 22539661 in words is "twenty-two million, five hundred thirty-nine thousand, six hundred sixty-one".