• 550 can be written using four 4's:
550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
550 is a Gilda number.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
550 is an undulating number in base 7.
It is a plaindrome in base 12, base 13, base 15 and base 16.
It is a nialpdrome in base 5 and base 10.
It is a congruent number.
550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.
550 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
550 is a wasteful number, since it uses less digits than its factorization.
550 is an evil number, because the sum of its binary digits is even.
The square root of 550 is about 23.4520787991. The cubic root of 550 is about 8.1932127060.
550 divided by its sum of digits (10) gives a palindrome (55).
Adding to 550 its product of nonzero digits (25), we get a palindrome (575).
Subtracting from 550 its product of nonzero digits (25), we obtain a palindrome (525).
550 divided by its product of nonzero digits (25) gives a palindrome (22).