Adding to 1155 its reverse (5511), we get a palindrome (6666).
Subtracting 1155 from its reverse (5511), we obtain a square (4356 = 662).
It is a nude number because it is divisible by every one of its digits.
It is an Ulam number.
1155 is a lucky number.
It is a plaindrome in base 10 and base 13.
It is a nialpdrome in base 11 and base 15.
It is a zygodrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 1155.
It is a congruent number.
21155 is an apocalyptic number.
1155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
1155 is a wasteful number, since it uses less digits than its factorization.
1155 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 26.
The square root of 1155 is about 33.9852909359. The cubic root of 1155 is about 10.4920574856.
The spelling of 1155 in words is "one thousand, one hundred fifty-five".