204788209 has 2 divisors, whose sum is σ = 204788210. Its totient is φ = 204788208.

The previous prime is 204788197. The next prime is 204788249. The reversal of 204788209 is 902887402.

204788209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (204788249) can be obtained adding 204788209 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109139809 + 95648400 = 10447^2 + 9780^2 .

It is a cyclic number.

It is not a de Polignac number, because 204788209 - 2¹⁷ = 204657137 is a prime.

It is not a weakly prime, because it can be changed into another prime (204788249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102394104 + 102394105.

It is an arithmetic number, because the mean of its divisors is an integer number (102394105).

Almost surely, 2^204788209 is an apocalyptic number.

It is an amenable number.

204788209 is a deficient number, since it is larger than the sum of its proper divisors (1).

204788209 is an equidigital number, since it uses as much as digits as its factorization.

204788209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 204788209 is about 14310.4230894827. The cubic root of 204788209 is about 589.4337274780.

The spelling of 204788209 in words is "two hundred four million, seven hundred eighty-eight thousand, two hundred nine".