256583 has 4 divisors (see below), whose sum is σ = 257640. Its totient is φ = 255528.

The previous prime is 256579. The next prime is 256589. The reversal of 256583 is 385652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256583 - 2² = 256579 is a prime.

It is a d-powerful number, because it can be written as 2 + 5 + 5⁷ + 6⁴ + 8 + 3¹¹ .

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

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256583.

It is not an unprimeable number, because it can be changed into a prime (256589) 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, 41 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (64410).

2²⁵⁶⁵⁸³ is an apocalyptic number.

256583 is a deficient number, since it is larger than the sum of its proper divisors (1057).

256583 is an equidigital number, since it uses as much as digits as its factorization.

256583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its digits is 7200, while the sum is 29.

The square root of 256583 is about 506.5402254510. The cubic root of 256583 is about 63.5442063066.

The spelling of 256583 in words is "two hundred fifty-six thousand, five hundred eighty-three".