204113209 has 2 divisors, whose sum is σ = 204113210. Its totient is φ = 204113208.

The previous prime is 204113197. The next prime is 204113249. The reversal of 204113209 is 902311402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204061225 + 51984 = 14285^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 204113209 - 2⁵ = 204113177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204113209.

It is not a weakly prime, because it can be changed into another prime (204113249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102056604 + 102056605.

It is an arithmetic number, because the mean of its divisors is an integer number (102056605).

Almost surely, 2^204113209 is an apocalyptic number.

It is an amenable number.

204113209 is a deficient number, since it is larger than the sum of its proper divisors (1).

204113209 is an equidigital number, since it uses as much as digits as its factorization.

204113209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 204113209 is about 14286.8194151113. The cubic root of 204113209 is about 588.7854061286.

The spelling of 204113209 in words is "two hundred four million, one hundred thirteen thousand, two hundred nine".