204662009 has 2 divisors, whose sum is σ = 204662010. Its totient is φ = 204662008.

The previous prime is 204661999. The next prime is 204662011. The reversal of 204662009 is 900266402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163123984 + 41538025 = 12772^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 204662009 - 2⁸ = 204661753 is a prime.

Together with 204662011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204662089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102331004 + 102331005.

It is an arithmetic number, because the mean of its divisors is an integer number (102331005).

Almost surely, 2^204662009 is an apocalyptic number.

It is an amenable number.

204662009 is a deficient number, since it is larger than the sum of its proper divisors (1).

204662009 is an equidigital number, since it uses as much as digits as its factorization.

204662009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 204662009 is about 14306.0130364822. The cubic root of 204662009 is about 589.3126237905.

The spelling of 204662009 in words is "two hundred four million, six hundred sixty-two thousand, nine".