256281 has 4 divisors (see below), whose sum is σ = 341712. Its totient is φ = 170852.

The previous prime is 256279. The next prime is 256301. The reversal of 256281 is 182652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256281 - 2¹ = 256279 is a prime.

It is a super-2 number, since 2×256281² = 131359901922, which contains 22 as substring.

It is a D-number.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256281.

It is not an unprimeable number, because it can be changed into a prime (256211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42711 + ... + 42716.

It is an arithmetic number, because the mean of its divisors is an integer number (85428).

2²⁵⁶²⁸¹ is an apocalyptic number.

It is an amenable number.

256281 is a deficient number, since it is larger than the sum of its proper divisors (85431).

256281 is an equidigital number, since it uses as much as digits as its factorization.

256281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85430.

The product of its digits is 960, while the sum is 24.

The square root of 256281 is about 506.2420369744. The cubic root of 256281 is about 63.5192658594.

The spelling of 256281 in words is "two hundred fifty-six thousand, two hundred eighty-one".