204508009 has 2 divisors, whose sum is σ = 204508010. Its totient is φ = 204508008.

The previous prime is 204507997. The next prime is 204508069. The reversal of 204508009 is 900805402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192432384 + 12075625 = 13872^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 204508009 - 2¹⁹ = 203983721 is a prime.

It is not a weakly prime, because it can be changed into another prime (204508069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102254004 + 102254005.

It is an arithmetic number, because the mean of its divisors is an integer number (102254005).

Almost surely, 2^204508009 is an apocalyptic number.

It is an amenable number.

204508009 is a deficient number, since it is larger than the sum of its proper divisors (1).

204508009 is an equidigital number, since it uses as much as digits as its factorization.

204508009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 204508009 is about 14300.6296714515. The cubic root of 204508009 is about 589.1647752850.

The spelling of 204508009 in words is "two hundred four million, five hundred eight thousand, nine".