256545 has 12 divisors (see below), whose sum is σ = 444756. Its totient is φ = 136800.

The previous prime is 256541. The next prime is 256561. The reversal of 256545 is 545652.

256545 is a `hidden beast` number, since 2 + 5 + 654 + 5 = 666.

256545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 159201 + 97344 = 399^2 + 312^2 .

It is not a de Polignac number, because 256545 - 2² = 256541 is a prime.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256545.

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 11 ways as a sum of consecutive naturals, for example, 2806 + ... + 2895.

It is an arithmetic number, because the mean of its divisors is an integer number (37063).

2²⁵⁶⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

256545 is a deficient number, since it is larger than the sum of its proper divisors (188211).

256545 is a wasteful number, since it uses less digits than its factorization.

256545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712 (or 5709 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 256545 is about 506.5027147015. The cubic root of 256545 is about 63.5410691813.

The spelling of 256545 in words is "two hundred fifty-six thousand, five hundred forty-five".