256271 has 4 divisors (see below), whose sum is σ = 257544. Its totient is φ = 255000.

The previous prime is 256219. The next prime is 256279. The reversal of 256271 is 172652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256271 - 2¹⁰ = 255247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256279) 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, 260 + ... + 761.

It is an arithmetic number, because the mean of its divisors is an integer number (64386).

2²⁵⁶²⁷¹ is an apocalyptic number.

256271 is a deficient number, since it is larger than the sum of its proper divisors (1273).

256271 is a wasteful number, since it uses less digits than its factorization.

256271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its digits is 840, while the sum is 23.

The square root of 256271 is about 506.2321601795. The cubic root of 256271 is about 63.5184396817.

The spelling of 256271 in words is "two hundred fifty-six thousand, two hundred seventy-one".