255801 has 16 divisors (see below), whose sum is σ = 420224. Its totient is φ = 134784.

The previous prime is 255767. The next prime is 255803. The reversal of 255801 is 108552.

It is not a de Polignac number, because 255801 - 2¹⁰ = 254777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (255803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196 + ... + 741.

It is an arithmetic number, because the mean of its divisors is an integer number (26264).

2²⁵⁵⁸⁰¹ is an apocalyptic number.

255801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255801 is a deficient number, since it is larger than the sum of its proper divisors (164423).

255801 is a wasteful number, since it uses less digits than its factorization.

255801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 255801 is about 505.7677332531. The cubic root of 255801 is about 63.4795850633.

The spelling of 255801 in words is "two hundred fifty-five thousand, eight hundred one".