605509 has 2 divisors, whose sum is σ = 605510. Its totient is φ = 605508.

The previous prime is 605503. The next prime is 605531. The reversal of 605509 is 905506.

It is a happy number.

605509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 225 = 778^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 605509 - 2⁵ = 605477 is a prime.

It is a super-2 number, since 2×605509² = 733282298162, which contains 22 as substring.

605509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (605503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302754 + 302755.

It is an arithmetic number, because the mean of its divisors is an integer number (302755).

2⁶⁰⁵⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

605509 is a deficient number, since it is larger than the sum of its proper divisors (1).

605509 is an equidigital number, since it uses as much as digits as its factorization.

605509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 605509 is about 778.1445881069. The cubic root of 605509 is about 84.6006177452.

The spelling of 605509 in words is "six hundred five thousand, five hundred nine".