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Puzzles of the Week (3)

First of all, thank you for your interest in those little (but sometimes hard) puzzles. I’ve actually missed the previous (and international !) week which was very busy. This week again a little change : you’ll still be able to read the new puzzles but the answers of the old ones will be published on "Le Pilote" website where a space has been created for our brain teasers !
Here is the link :
http://le-pilote.fr/puzzles-of-the-week/

Let’s start with our new puzzles then :

Puzzle 7 :

« All the house numbers on my street are odd. My numbers has three digits and is a perfect square. Moreover, if the number plate were rotated 180 degrees it would show a prime number comprising the same three digits arranged differently. What is my house number ? »

Puzzle 8 :

«  Find a pattern :
3#4 = 5
4#7 = 1
8#4 = 0
1#2 = 9
if you find a pattern, then
5#5 = ?
4#1 = ?
6#2 = ?
 »

Puzzle 9 :

« If the three digits of a certain three-digit number are added and the result is cubed, the final answer is the original number. What is the number ? »

Good luck !
X.G