22685609 has 2 divisors, whose sum is σ = 22685610. Its totient is φ = 22685608.

The previous prime is 22685603. The next prime is 22685651. The reversal of 22685609 is 90658622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14845609 + 7840000 = 3853^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 22685609 - 2¹² = 22681513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22685603) 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, 11342804 + 11342805.

It is an arithmetic number, because the mean of its divisors is an integer number (11342805).

Almost surely, 2^22685609 is an apocalyptic number.

It is an amenable number.

22685609 is a deficient number, since it is larger than the sum of its proper divisors (1).

22685609 is an equidigital number, since it uses as much as digits as its factorization.

22685609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 22685609 is about 4762.9412131581. The cubic root of 22685609 is about 283.0849715919.

The spelling of 22685609 in words is "twenty-two million, six hundred eighty-five thousand, six hundred nine".