256289 has 8 divisors (see below), whose sum is σ = 292032. Its totient is φ = 222640.

The previous prime is 256279. The next prime is 256301. The reversal of 256289 is 982652.

256289 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 256289 - 2⁸ = 256033 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256219) 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, 254 + ... + 759.

It is an arithmetic number, because the mean of its divisors is an integer number (36504).

2²⁵⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

256289 is a deficient number, since it is larger than the sum of its proper divisors (35743).

256289 is a wasteful number, since it uses less digits than its factorization.

256289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047.

The product of its digits is 8640, while the sum is 32.

The square root of 256289 is about 506.2499382716. The cubic root of 256289 is about 63.5199267860.

It can be divided in two parts, 256 and 289, that multiplied together give a square (73984 = 272²).

The spelling of 256289 in words is "two hundred fifty-six thousand, two hundred eighty-nine".