605909 has 2 divisors, whose sum is σ = 605910. Its totient is φ = 605908.

The previous prime is 605893. The next prime is 605921. The reversal of 605909 is 909506.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 625 = 778^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 605909 - 2⁴ = 605893 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 605909.

It is not a weakly prime, because it can be changed into another prime (605009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302954 + 302955.

It is an arithmetic number, because the mean of its divisors is an integer number (302955).

2⁶⁰⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

605909 is a deficient number, since it is larger than the sum of its proper divisors (1).

605909 is an equidigital number, since it uses as much as digits as its factorization.

605909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 605909 is about 778.4015673160. The cubic root of 605909 is about 84.6192427357.

It can be divided in two parts, 605 and 909, that multiplied together give a palindrome (549945).

The spelling of 605909 in words is "six hundred five thousand, nine hundred nine".