256547 has 4 divisors (see below), whose sum is σ = 271656. Its totient is φ = 241440.

The previous prime is 256541. The next prime is 256561. The reversal of 256547 is 745652.

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 256547 - 2⁶ = 256483 is a prime.

It is a d-powerful number, because it can be written as 2¹⁶ + 5² + 5² + 6⁵ + 4⁸ + 7⁶ .

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256541) 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, 7529 + ... + 7562.

It is an arithmetic number, because the mean of its divisors is an integer number (67914).

2²⁵⁶⁵⁴⁷ is an apocalyptic number.

256547 is a deficient number, since it is larger than the sum of its proper divisors (15109).

256547 is a wasteful number, since it uses less digits than its factorization.

256547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15108.

The product of its digits is 8400, while the sum is 29.

The square root of 256547 is about 506.5046890207. The cubic root of 256547 is about 63.5412343009.

The spelling of 256547 in words is "two hundred fifty-six thousand, five hundred forty-seven".