255979 has 4 divisors (see below), whose sum is σ = 261976. Its totient is φ = 249984.

The previous prime is 255977. The next prime is 255989. The reversal of 255979 is 979552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255979 - 2¹ = 255977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2934 + ... + 3019.

It is an arithmetic number, because the mean of its divisors is an integer number (65494).

2²⁵⁵⁹⁷⁹ is an apocalyptic number.

255979 is a deficient number, since it is larger than the sum of its proper divisors (5997).

255979 is an equidigital number, since it uses as much as digits as its factorization.

255979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5996.

The product of its digits is 28350, while the sum is 37.

The square root of 255979 is about 505.9436727542. The cubic root of 255979 is about 63.4943058114.

The spelling of 255979 in words is "two hundred fifty-five thousand, nine hundred seventy-nine".