2015509 has 2 divisors, whose sum is σ = 2015510. Its totient is φ = 2015508.

The previous prime is 2015491. The next prime is 2015543. The reversal of 2015509 is 9055102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1830609 + 184900 = 1353^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015509 - 2⁹ = 2014997 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2015509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2015579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007754 + 1007755.

It is an arithmetic number, because the mean of its divisors is an integer number (1007755).

2^2015509 is an apocalyptic number.

It is an amenable number.

2015509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015509 is an equidigital number, since it uses as much as digits as its factorization.

2015509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 2015509 is about 1419.6862329402. The cubic root of 2015509 is about 126.3169353910.

The spelling of 2015509 in words is "two million, fifteen thousand, five hundred nine".