204505313 has 2 divisors, whose sum is σ = 204505314. Its totient is φ = 204505312.

The previous prime is 204505307. The next prime is 204505321. The reversal of 204505313 is 313505402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156175009 + 48330304 = 12497^2 + 6952^2 .

It is a cyclic number.

It is not a de Polignac number, because 204505313 - 2⁸ = 204505057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (204505333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102252656 + 102252657.

It is an arithmetic number, because the mean of its divisors is an integer number (102252657).

Almost surely, 2^204505313 is an apocalyptic number.

It is an amenable number.

204505313 is a deficient number, since it is larger than the sum of its proper divisors (1).

204505313 is an equidigital number, since it uses as much as digits as its factorization.

204505313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 204505313 is about 14300.5354095572. The cubic root of 204505313 is about 589.1621863151.

The spelling of 204505313 in words is "two hundred four million, five hundred five thousand, three hundred thirteen".