605309 has 2 divisors, whose sum is σ = 605310. Its totient is φ = 605308.

The previous prime is 605261. The next prime is 605323. The reversal of 605309 is 903506.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 25 = 778^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-605309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (605329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302654 + 302655.

It is an arithmetic number, because the mean of its divisors is an integer number (302655).

2⁶⁰⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

605309 is a deficient number, since it is larger than the sum of its proper divisors (1).

605309 is an equidigital number, since it uses as much as digits as its factorization.

605309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 605309 is about 778.0160666721. The cubic root of 605309 is about 84.5913021739.

The spelling of 605309 in words is "six hundred five thousand, three hundred nine".