255391 has 8 divisors (see below), whose sum is σ = 275184. Its totient is φ = 236160.

The previous prime is 255383. The next prime is 255413. The reversal of 255391 is 193552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255391 - 2³ = 255383 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 5 + 3¹¹ + 5⁷ + 9² + 1 .

It is a Duffinian number.

255391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255361) 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 7 ways as a sum of consecutive naturals, for example, 1321 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (34398).

2²⁵⁵³⁹¹ is an apocalyptic number.

255391 is a deficient number, since it is larger than the sum of its proper divisors (19793).

255391 is a wasteful number, since it uses less digits than its factorization.

255391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its digits is 1350, while the sum is 25.

The square root of 255391 is about 505.3622463145. The cubic root of 255391 is about 63.4456517225.

It can be divided in two parts, 255 and 391, that added together give a palindrome (646).

The spelling of 255391 in words is "two hundred fifty-five thousand, three hundred ninety-one".