Adding to 281 its sum of digits (11), we get a palindrome (292).
Subtracting from 281 its reverse (182), we obtain a palindrome (99).
281 is nontrivially palindromic in base 14.
281 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.
It is a strong prime.
It is a cyclic number.
It is a Sophie Germain prime.
It is a Chen prime.
It is a magnanimous number.
281 is an undulating number in base 14.
It is a Curzon number.
It is a plaindrome in base 6, base 11, base 13, base 15 and base 16.
It is a nialpdrome in base 5, base 7 and base 8.
281 is the 8-th centered decagonal number.
It is an amenable number.
281 is an equidigital number, since it uses as much as digits as its factorization.
281 is an evil number, because the sum of its binary digits is even.
The square root of 281 is about 16.7630546142. The cubic root of 281 is about 6.5499116201.
The spelling of 281 in words is "two hundred eighty-one", and thus it is an aban number.