204425209 has 2 divisors, whose sum is σ = 204425210. Its totient is φ = 204425208.

The previous prime is 204425203. The next prime is 204425227. The reversal of 204425209 is 902524402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175297600 + 29127609 = 13240^2 + 5397^2 .

It is a cyclic number.

It is not a de Polignac number, because 204425209 - 2⁹ = 204424697 is a prime.

It is not a weakly prime, because it can be changed into another prime (204425203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102212604 + 102212605.

It is an arithmetic number, because the mean of its divisors is an integer number (102212605).

Almost surely, 2^204425209 is an apocalyptic number.

It is an amenable number.

204425209 is a deficient number, since it is larger than the sum of its proper divisors (1).

204425209 is an equidigital number, since it uses as much as digits as its factorization.

204425209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 204425209 is about 14297.7344009462. The cubic root of 204425209 is about 589.0852520285.

It can be divided in two parts, 20442 and 5209, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 204425209 in words is "two hundred four million, four hundred twenty-five thousand, two hundred nine".