256189 has 2 divisors, whose sum is σ = 256190. Its totient is φ = 256188.
The previous prime is 256187. The next prime is 256199. The reversal of 256189 is 981652.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 184900 + 71289 = 430^2 + 267^2 .
It is a cyclic number.
It is not a de Polignac number, because 256189 - 21 = 256187 is a prime.
Together with 256187, it forms a pair of twin primes.
It is an alternating number because its digits alternate between even and odd.
It is a self number, because there is not a number n which added to its sum of digits gives 256189.
It is a congruent number.
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, 128094 + 128095.
It is an arithmetic number, because the mean of its divisors is an integer number (128095).
2256189 is an apocalyptic number.
It is an amenable number.
256189 is a deficient number, since it is larger than the sum of its proper divisors (1).
256189 is an equidigital number, since it uses as much as digits as its factorization.
256189 is an evil number, because the sum of its binary digits is even.
The product of its digits is 4320, while the sum is 31.
The square root of 256189 is about 506.1511631914. The cubic root of 256189 is about 63.5116642140.
It can be divided in two parts, 256 and 189, that multiplied together give a palindrome (48384).
The spelling of 256189 in words is "two hundred fifty-six thousand, one hundred eighty-nine".
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