256471 has 2 divisors, whose sum is σ = 256472. Its totient is φ = 256470.

The previous prime is 256469. The next prime is 256483. The reversal of 256471 is 174652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256471 - 2¹ = 256469 is a prime.

It is a super-3 number, since 3×256471³ = 50609966539125333, which contains 333 as substring.

Together with 256469, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256441) 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 as a sum of consecutive naturals, namely, 128235 + 128236.

It is an arithmetic number, because the mean of its divisors is an integer number (128236).

2²⁵⁶⁴⁷¹ is an apocalyptic number.

256471 is a deficient number, since it is larger than the sum of its proper divisors (1).

256471 is an equidigital number, since it uses as much as digits as its factorization.

256471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 25.

The square root of 256471 is about 506.4296594790. The cubic root of 256471 is about 63.5349591534.

It can be divided in two parts, 256 and 471, that added together give a palindrome (727).

The spelling of 256471 in words is "two hundred fifty-six thousand, four hundred seventy-one".