204361909 has 2 divisors, whose sum is σ = 204361910. Its totient is φ = 204361908.

The previous prime is 204361907. The next prime is 204361931. The reversal of 204361909 is 909163402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 14884 = 14295^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 204361909 - 2¹ = 204361907 is a prime.

Together with 204361907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204361907) 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, 102180954 + 102180955.

It is an arithmetic number, because the mean of its divisors is an integer number (102180955).

Almost surely, 2^204361909 is an apocalyptic number.

It is an amenable number.

204361909 is a deficient number, since it is larger than the sum of its proper divisors (1).

204361909 is an equidigital number, since it uses as much as digits as its factorization.

204361909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 204361909 is about 14295.5205921296. The cubic root of 204361909 is about 589.0244425910.

The spelling of 204361909 in words is "two hundred four million, three hundred sixty-one thousand, nine hundred nine".