It is a happy number.
1285 is nontrivially palindromic in base 2, base 4 and base 16.
It is a semiprime because it is the product of two primes.
It is a 5-Lehmer number, since φ(1285) divides (1285-1)5.
It is a cyclic number.
It is a house number.
It is a Duffinian number.
1285 is an undulating number in base 16.
1285 is a lucky number.
It is a plaindrome in base 9, base 13, base 14 and base 15.
It is a nialpdrome in base 6.
It is a zygodrome in base 4.
It is a congruent number.
In principle, a polygon with 1285 sides can be constructed with ruler and compass.
1285 is a Friedman number, since it can be written as 5*(2^8+1), using all its digits and the basic arithmetic operations.
21285 is an apocalyptic number.
It is an amenable number.
1285 is an equidigital number, since it uses as much as digits as its factorization.
1285 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 262.
The square root of 1285 is about 35.8468966579. The cubic root of 1285 is about 10.8717896897.
The spelling of 1285 in words is "one thousand, two hundred eighty-five".