256567 has 2 divisors, whose sum is σ = 256568. Its totient is φ = 256566.

The previous prime is 256561. The next prime is 256577. The reversal of 256567 is 765652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256567 - 2¹¹ = 254519 is a prime.

It is a Chen prime.

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

256567 is a lucky number.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128283 + 128284.

It is an arithmetic number, because the mean of its divisors is an integer number (128284).

2²⁵⁶⁵⁶⁷ is an apocalyptic number.

256567 is a deficient number, since it is larger than the sum of its proper divisors (1).

256567 is an equidigital number, since it uses as much as digits as its factorization.

256567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 31.

The square root of 256567 is about 506.5244317898. The cubic root of 256567 is about 63.5428854495.

The spelling of 256567 in words is "two hundred fifty-six thousand, five hundred sixty-seven".