9221809 has 2 divisors, whose sum is σ = 9221810. Its totient is φ = 9221808.

The previous prime is 9221801. The next prime is 9221819. The reversal of 9221809 is 9081229.

9221809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6426225 + 2795584 = 2535^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 9221809 - 2³ = 9221801 is a prime.

It is a super-2 number, since 2×9221809² = 170083522464962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9221801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4610904 + 4610905.

It is an arithmetic number, because the mean of its divisors is an integer number (4610905).

Almost surely, 2^9221809 is an apocalyptic number.

It is an amenable number.

9221809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9221809 is an equidigital number, since it uses as much as digits as its factorization.

9221809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 9221809 is about 3036.7431567388. The cubic root of 9221809 is about 209.7033528829.

The spelling of 9221809 in words is "nine million, two hundred twenty-one thousand, eight hundred nine".