205350209 has 2 divisors, whose sum is σ = 205350210. Its totient is φ = 205350208.

The previous prime is 205350199. The next prime is 205350221. The reversal of 205350209 is 902053502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204575809 + 774400 = 14303^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 205350209 - 2⁴ = 205350193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205350269) 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, 102675104 + 102675105.

It is an arithmetic number, because the mean of its divisors is an integer number (102675105).

Almost surely, 2^205350209 is an apocalyptic number.

It is an amenable number.

205350209 is a deficient number, since it is larger than the sum of its proper divisors (1).

205350209 is an equidigital number, since it uses as much as digits as its factorization.

205350209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 205350209 is about 14330.0456733396. The cubic root of 205350209 is about 589.9724290477.

The spelling of 205350209 in words is "two hundred five million, three hundred fifty thousand, two hundred nine".