2015609 has 2 divisors, whose sum is σ = 2015610. Its totient is φ = 2015608.

The previous prime is 2015599. The next prime is 2015621. The reversal of 2015609 is 9065102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1882384 + 133225 = 1372^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015609 - 2¹⁶ = 1950073 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 (2015669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007804 + 1007805.

It is an arithmetic number, because the mean of its divisors is an integer number (1007805).

2^2015609 is an apocalyptic number.

It is an amenable number.

2015609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015609 is an equidigital number, since it uses as much as digits as its factorization.

2015609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2015609 is about 1419.7214515531. The cubic root of 2015609 is about 126.3190244390.

The spelling of 2015609 in words is "two million, fifteen thousand, six hundred nine".