22564537 has 2 divisors, whose sum is σ = 22564538. Its totient is φ = 22564536.

The previous prime is 22564513. The next prime is 22564543. The reversal of 22564537 is 73546522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22127616 + 436921 = 4704^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 22564537 - 2²³ = 14175929 is a prime.

It is not a weakly prime, because it can be changed into another prime (22564547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11282268 + 11282269.

It is an arithmetic number, because the mean of its divisors is an integer number (11282269).

Almost surely, 2^22564537 is an apocalyptic number.

It is an amenable number.

22564537 is a deficient number, since it is larger than the sum of its proper divisors (1).

22564537 is an equidigital number, since it uses as much as digits as its factorization.

22564537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 34.

The square root of 22564537 is about 4750.2144162132. The cubic root of 22564537 is about 282.5804694145.

The spelling of 22564537 in words is "twenty-two million, five hundred sixty-four thousand, five hundred thirty-seven".