204326809 has 2 divisors, whose sum is σ = 204326810. Its totient is φ = 204326808.

The previous prime is 204326777. The next prime is 204326831. The reversal of 204326809 is 908623402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163328400 + 40998409 = 12780^2 + 6403^2 .

It is a cyclic number.

It is not a de Polignac number, because 204326809 - 2⁵ = 204326777 is a prime.

It is a super-2 number, since 2×204326809² = 83498889752244962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204326509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102163404 + 102163405.

It is an arithmetic number, because the mean of its divisors is an integer number (102163405).

Almost surely, 2^204326809 is an apocalyptic number.

It is an amenable number.

204326809 is a deficient number, since it is larger than the sum of its proper divisors (1).

204326809 is an equidigital number, since it uses as much as digits as its factorization.

204326809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 204326809 is about 14294.2928821261. The cubic root of 204326809 is about 588.9907182017.

The spelling of 204326809 in words is "two hundred four million, three hundred twenty-six thousand, eight hundred nine".