2013509 has 4 divisors (see below), whose sum is σ = 2018016. Its totient is φ = 2009004.

The previous prime is 2013491. The next prime is 2013511. The reversal of 2013509 is 9053102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9053102 = 2 ⋅4526551.

It is a cyclic number.

It is not a de Polignac number, because 2013509 - 2¹⁶ = 1947973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499 + ... + 2504.

It is an arithmetic number, because the mean of its divisors is an integer number (504504).

2^2013509 is an apocalyptic number.

It is an amenable number.

2013509 is a deficient number, since it is larger than the sum of its proper divisors (4507).

2013509 is an equidigital number, since it uses as much as digits as its factorization.

2013509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 2013509 is about 1418.9816771192. The cubic root of 2013509 is about 126.2751399140.

The spelling of 2013509 in words is "two million, thirteen thousand, five hundred nine".