203404009 has 2 divisors, whose sum is σ = 203404010. Its totient is φ = 203404008.

The previous prime is 203404007. The next prime is 203404079. The reversal of 203404009 is 900404302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128754409 + 74649600 = 11347^2 + 8640^2 .

It is a cyclic number.

It is not a de Polignac number, because 203404009 - 2¹ = 203404007 is a prime.

Together with 203404007, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (203404007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101702004 + 101702005.

It is an arithmetic number, because the mean of its divisors is an integer number (101702005).

Almost surely, 2^203404009 is an apocalyptic number.

It is an amenable number.

203404009 is a deficient number, since it is larger than the sum of its proper divisors (1).

203404009 is an equidigital number, since it uses as much as digits as its factorization.

203404009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 203404009 is about 14261.9777380278. The cubic root of 203404009 is about 588.1026948603.

The spelling of 203404009 in words is "two hundred three million, four hundred four thousand, nine".