• 41 can be written using four 4's:
41 is nontrivially palindromic in base 5.
41 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
41 is an esthetic number in base 7, base 9 and base 13, because in such bases 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.
It is an alternating number because its digits alternate between even and odd.
41 is an undulating number in base 5.
It is a Curzon number.
It is a plaindrome in base 3, base 7, base 9, base 11, base 12, base 14, base 15 and base 16.
It is a nialpdrome in base 4, base 8, base 10 and base 13.
It is a congruent number.
It is a good prime.
41 is the 5-th centered square number.
It is an amenable number.
41 is an equidigital number, since it uses as much as digits as its factorization.
41 is an odious number, because the sum of its binary digits is odd.
The square root of 41 is about 6.4031242374. The cubic root of 41 is about 3.4482172404.
Adding to 41 its reverse (14), we get a palindrome (55).
Subtracting from 41 its reverse (14), we obtain a cube (27 = 33).