256187 has 2 divisors, whose sum is σ = 256188. Its totient is φ = 256186.

The previous prime is 256181. The next prime is 256189. The reversal of 256187 is 781652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256187 - 2¹⁴ = 239803 is a prime.

Together with 256189, it forms a pair of twin primes.

It is a Chen 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 256187.

It is not a weakly prime, because it can be changed into another prime (256181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128093 + 128094.

It is an arithmetic number, because the mean of its divisors is an integer number (128094).

2²⁵⁶¹⁸⁷ is an apocalyptic number.

256187 is a deficient number, since it is larger than the sum of its proper divisors (1).

256187 is an equidigital number, since it uses as much as digits as its factorization.

256187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 256187 is about 506.1491874932. The cubic root of 256187 is about 63.5114989406.

The spelling of 256187 in words is "two hundred fifty-six thousand, one hundred eighty-seven".