• Deleting all the even digits from 2118 we obtain a prime (333999959517571).
• 118 can be written using four 4's:
118 is nontrivially palindromic in base 9.
118 is an esthetic number in base 12 and base 16, because in such bases its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It is a magnanimous number.
118 is an undulating number in base 9.
It is a plaindrome in base 7, base 8, base 10, base 12 and base 15.
It is a nialpdrome in base 5, base 11, base 13, base 14 and base 16.
It is a congruent number.
118 is an equidigital number, since it uses as much as digits as its factorization.
118 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 61.
The square root of 118 is about 10.8627804912. The cubic root of 118 is about 4.9048681315.
Adding to 118 its sum of digits (10), we get a 7-th power (128 = 27).
Adding to 118 its reverse (811), we get a palindrome (929).
The spelling of 118 in words is "one hundred eighteen", and thus it is an aban number.