22809209 has 2 divisors, whose sum is σ = 22809210. Its totient is φ = 22809208.

The previous prime is 22809203. The next prime is 22809217. The reversal of 22809209 is 90290822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 3139984 = 4435^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 22809209 - 2¹⁶ = 22743673 is a prime.

It is a Chen prime.

It is equal to p_1436945 and since 22809209 and 1436945 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (22809203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11404604 + 11404605.

It is an arithmetic number, because the mean of its divisors is an integer number (11404605).

Almost surely, 2^22809209 is an apocalyptic number.

It is an amenable number.

22809209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22809209 is an equidigital number, since it uses as much as digits as its factorization.

22809209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 22809209 is about 4775.8987635837. The cubic root of 22809209 is about 283.5981596228.

The spelling of 22809209 in words is "twenty-two million, eight hundred nine thousand, two hundred nine".