256341 has 4 divisors (see below), whose sum is σ = 341792. Its totient is φ = 170892.

The previous prime is 256337. The next prime is 256349. The reversal of 256341 is 143652.

It is a happy number.

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 not a de Polignac number, because 256341 - 2² = 256337 is a prime.

It is a d-powerful number, because it can be written as 2³ + 5⁷ + 3¹¹ + 6² + 4⁵ + 1 .

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42721 + ... + 42726.

It is an arithmetic number, because the mean of its divisors is an integer number (85448).

2²⁵⁶³⁴¹ is an apocalyptic number.

It is an amenable number.

256341 is a deficient number, since it is larger than the sum of its proper divisors (85451).

256341 is an equidigital number, since it uses as much as digits as its factorization.

256341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85450.

The product of its digits is 720, while the sum is 21.

The square root of 256341 is about 506.3012936977. The cubic root of 256341 is about 63.5242224741.

Adding to 256341 its reverse (143652), we get a palindrome (399993).

The spelling of 256341 in words is "two hundred fifty-six thousand, three hundred forty-one".