204650009 has 2 divisors, whose sum is σ = 204650010. Its totient is φ = 204650008.

The previous prime is 204649993. The next prime is 204650011. The reversal of 204650009 is 900056402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117787609 + 86862400 = 10853^2 + 9320^2 .

It is a cyclic number.

It is not a de Polignac number, because 204650009 - 2⁴ = 204649993 is a prime.

Together with 204650011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204650009.

It is not a weakly prime, because it can be changed into another prime (204650099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102325004 + 102325005.

It is an arithmetic number, because the mean of its divisors is an integer number (102325005).

Almost surely, 2^204650009 is an apocalyptic number.

It is an amenable number.

204650009 is a deficient number, since it is larger than the sum of its proper divisors (1).

204650009 is an equidigital number, since it uses as much as digits as its factorization.

204650009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 204650009 is about 14305.5936262708. The cubic root of 204650009 is about 589.3011057927.

The spelling of 204650009 in words is "two hundred four million, six hundred fifty thousand, nine".