22206809 has 2 divisors, whose sum is σ = 22206810. Its totient is φ = 22206808.

The previous prime is 22206739. The next prime is 22206827. The reversal of 22206809 is 90860222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 10061584 = 3485^2 + 3172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22206809 is a prime.

It is not a weakly prime, because it can be changed into another prime (22206829) 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, 11103404 + 11103405.

It is an arithmetic number, because the mean of its divisors is an integer number (11103405).

Almost surely, 2^22206809 is an apocalyptic number.

It is an amenable number.

22206809 is a deficient number, since it is larger than the sum of its proper divisors (1).

22206809 is an equidigital number, since it uses as much as digits as its factorization.

22206809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 22206809 is about 4712.4101052434. The cubic root of 22206809 is about 281.0792066580.

The spelling of 22206809 in words is "twenty-two million, two hundred six thousand, eight hundred nine".