22845209 has 2 divisors, whose sum is σ = 22845210. Its totient is φ = 22845208.

The previous prime is 22845203. The next prime is 22845223. The reversal of 22845209 is 90254822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21529600 + 1315609 = 4640^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 22845209 - 2¹² = 22841113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22845203) 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, 11422604 + 11422605.

It is an arithmetic number, because the mean of its divisors is an integer number (11422605).

Almost surely, 2^22845209 is an apocalyptic number.

It is an amenable number.

22845209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22845209 is an equidigital number, since it uses as much as digits as its factorization.

22845209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 22845209 is about 4779.6662017342. Note that the first 3 decimals coincide. The cubic root of 22845209 is about 283.7472831220.

The spelling of 22845209 in words is "twenty-two million, eight hundred forty-five thousand, two hundred nine".