255521 has 8 divisors (see below), whose sum is σ = 295104. Its totient is φ = 216720.

The previous prime is 255517. The next prime is 255523. The reversal of 255521 is 125552.

255521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 255521 - 2² = 255517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255493 and 255502.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255521.

It is not an unprimeable number, because it can be changed into a prime (255523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (36888).

2²⁵⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

255521 is a deficient number, since it is larger than the sum of its proper divisors (39583).

255521 is a wasteful number, since it uses less digits than its factorization.

255521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 500, while the sum is 20.

The square root of 255521 is about 505.4908505601. The cubic root of 255521 is about 63.4564150040.

The spelling of 255521 in words is "two hundred fifty-five thousand, five hundred twenty-one".