2003509 has 2 divisors, whose sum is σ = 2003510. Its totient is φ = 2003508.

The previous prime is 2003497. The next prime is 2003557. The reversal of 2003509 is 9053002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 815409 = 1090^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003509 - 2⁷ = 2003381 is a prime.

It is a Chen prime.

2003509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2003009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001754 + 1001755.

It is an arithmetic number, because the mean of its divisors is an integer number (1001755).

2^2003509 is an apocalyptic number.

It is an amenable number.

2003509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003509 is an equidigital number, since it uses as much as digits as its factorization.

2003509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 2003509 is about 1415.4536375311. The cubic root of 2003509 is about 126.0657463211.

The spelling of 2003509 in words is "two million, three thousand, five hundred nine".