2591609 has 2 divisors, whose sum is σ = 2591610. Its totient is φ = 2591608.

The previous prime is 2591587. The next prime is 2591623. The reversal of 2591609 is 9061952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1951609 + 640000 = 1397^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2591609 - 2²⁰ = 1543033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2591669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295804 + 1295805.

It is an arithmetic number, because the mean of its divisors is an integer number (1295805).

2^2591609 is an apocalyptic number.

It is an amenable number.

2591609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591609 is an equidigital number, since it uses as much as digits as its factorization.

2591609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 2591609 is about 1609.8475083063. The cubic root of 2591609 is about 137.3588016098.

The spelling of 2591609 in words is "two million, five hundred ninety-one thousand, six hundred nine".