255309 has 4 divisors (see below), whose sum is σ = 340416. Its totient is φ = 170204.

The previous prime is 255259. The next prime is 255313. The reversal of 255309 is 903552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255309 - 2⁷ = 255181 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

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 255309.

It is not an unprimeable number, because it can be changed into a prime (255329) 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 in 3 ways as a sum of consecutive naturals, for example, 42549 + ... + 42554.

It is an arithmetic number, because the mean of its divisors is an integer number (85104).

2²⁵⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

255309 is a deficient number, since it is larger than the sum of its proper divisors (85107).

255309 is an equidigital number, since it uses as much as digits as its factorization.

255309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85106.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 255309 is about 505.2811098785. The cubic root of 255309 is about 63.4388606970.

The spelling of 255309 in words is "two hundred fifty-five thousand, three hundred nine".