204955409 has 2 divisors, whose sum is σ = 204955410. Its totient is φ = 204955408.

The previous prime is 204955393. The next prime is 204955423. The reversal of 204955409 is 904559402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106151809 + 98803600 = 10303^2 + 9940^2 .

It is a cyclic number.

It is not a de Polignac number, because 204955409 - 2⁴ = 204955393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204955459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102477704 + 102477705.

It is an arithmetic number, because the mean of its divisors is an integer number (102477705).

Almost surely, 2^204955409 is an apocalyptic number.

It is an amenable number.

204955409 is a deficient number, since it is larger than the sum of its proper divisors (1).

204955409 is an equidigital number, since it uses as much as digits as its factorization.

204955409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 204955409 is about 14316.2637933226. The cubic root of 204955409 is about 589.5940988693.

The spelling of 204955409 in words is "two hundred four million, nine hundred fifty-five thousand, four hundred nine".