255901 has 4 divisors (see below), whose sum is σ = 270972. Its totient is φ = 240832.

The previous prime is 255887. The next prime is 255907. The reversal of 255901 is 109552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 225625 + 30276 = 475^2 + 174^2 .

It is a cyclic number.

It is not a de Polignac number, because 255901 - 2⁵ = 255869 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7510 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (67743).

2²⁵⁵⁹⁰¹ is an apocalyptic number.

It is an amenable number.

255901 is a deficient number, since it is larger than the sum of its proper divisors (15071).

255901 is a wasteful number, since it uses less digits than its factorization.

255901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15070.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 255901 is about 505.8665832015. The cubic root of 255901 is about 63.4878559867.

It can be divided in two parts, 255 and 901, that added together give a square (1156 = 34²).

The spelling of 255901 in words is "two hundred fifty-five thousand, nine hundred one".