2605609 has 2 divisors, whose sum is σ = 2605610. Its totient is φ = 2605608.

The previous prime is 2605579. The next prime is 2605613. The reversal of 2605609 is 9065062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2576025 + 29584 = 1605^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605609 - 2⁷ = 2605481 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2605409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302804 + 1302805.

It is an arithmetic number, because the mean of its divisors is an integer number (1302805).

2^2605609 is an apocalyptic number.

It is an amenable number.

2605609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605609 is an equidigital number, since it uses as much as digits as its factorization.

2605609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2605609 is about 1614.1898896970. The cubic root of 2605609 is about 137.6056972413.

The spelling of 2605609 in words is "two million, six hundred five thousand, six hundred nine".