203404304209 has 2 divisors, whose sum is σ = 203404304210. Its totient is φ = 203404304208.

The previous prime is 203404304189. The next prime is 203404304293. The reversal of 203404304209 is 902403404302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192953740225 + 10450563984 = 439265^2 + 102228^2 .

It is a cyclic number.

It is not a de Polignac number, because 203404304209 - 2¹⁹ = 203403779921 is a prime.

It is not a weakly prime, because it can be changed into another prime (203404304809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101702152104 + 101702152105.

It is an arithmetic number, because the mean of its divisors is an integer number (101702152105).

Almost surely, 2^203404304209 is an apocalyptic number.

It is an amenable number.

203404304209 is a deficient number, since it is larger than the sum of its proper divisors (1).

203404304209 is an equidigital number, since it uses as much as digits as its factorization.

203404304209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

The spelling of 203404304209 in words is "two hundred three billion, four hundred four million, three hundred four thousand, two hundred nine".