605609 has 2 divisors, whose sum is σ = 605610. Its totient is φ = 605608.

The previous prime is 605603. The next prime is 605617. The reversal of 605609 is 906506.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 75625 = 728^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 605609 - 2⁴ = 605593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (605603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302804 + 302805.

It is an arithmetic number, because the mean of its divisors is an integer number (302805).

2⁶⁰⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

605609 is a deficient number, since it is larger than the sum of its proper divisors (1).

605609 is an equidigital number, since it uses as much as digits as its factorization.

605609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 605609 is about 778.2088408647. The cubic root of 605609 is about 84.6052747616.

The spelling of 605609 in words is "six hundred five thousand, six hundred nine".