255481 has 4 divisors (see below), whose sum is σ = 256500. Its totient is φ = 254464.

The previous prime is 255473. The next prime is 255487. The reversal of 255481 is 184552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 95481 + 160000 = 309^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 255481 - 2³ = 255473 is a prime.

It is a super-2 number, since 2×255481² = 130541082722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255487) 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, 165 + ... + 733.

It is an arithmetic number, because the mean of its divisors is an integer number (64125).

2²⁵⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

255481 is a deficient number, since it is larger than the sum of its proper divisors (1019).

255481 is an equidigital number, since it uses as much as digits as its factorization.

255481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its digits is 1600, while the sum is 25.

The square root of 255481 is about 505.4512835081. The cubic root of 255481 is about 63.4531036139.

The spelling of 255481 in words is "two hundred fifty-five thousand, four hundred eighty-one".