203040209 has 2 divisors, whose sum is σ = 203040210. Its totient is φ = 203040208.

The previous prime is 203040179. The next prime is 203040259. The reversal of 203040209 is 902040302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186459025 + 16581184 = 13655^2 + 4072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203040209 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (203040259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101520104 + 101520105.

It is an arithmetic number, because the mean of its divisors is an integer number (101520105).

Almost surely, 2^203040209 is an apocalyptic number.

It is an amenable number.

203040209 is a deficient number, since it is larger than the sum of its proper divisors (1).

203040209 is an equidigital number, since it uses as much as digits as its factorization.

203040209 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 20.

The square root of 203040209 is about 14249.2178381833. The cubic root of 203040209 is about 587.7518668974.

The spelling of 203040209 in words is "two hundred three million, forty thousand, two hundred nine".