204089009 has 2 divisors, whose sum is σ = 204089010. Its totient is φ = 204089008.

The previous prime is 204088957. The next prime is 204089057. The reversal of 204089009 is 900980402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176757025 + 27331984 = 13295^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 204089009 - 2²⁰ = 203040433 is a prime.

It is not a weakly prime, because it can be changed into another prime (204089059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102044504 + 102044505.

It is an arithmetic number, because the mean of its divisors is an integer number (102044505).

Almost surely, 2^204089009 is an apocalyptic number.

It is an amenable number.

204089009 is a deficient number, since it is larger than the sum of its proper divisors (1).

204089009 is an equidigital number, since it uses as much as digits as its factorization.

204089009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 204089009 is about 14285.9724555243. The cubic root of 204089009 is about 588.7621360847.

The spelling of 204089009 in words is "two hundred four million, eighty-nine thousand, nine".