Elementary number theory - prerequisites Since summer comes with a lot of spare time, I've decided to select a mathematical subject I want to learn as much as possible about over the next three months. That being said, number theory really caught my eye, but I have no prior training in it. 
I've decided to conduct my studying effort in a library; I prefer real books to virtual ones, but as I'm not allowed to browse through the books on my own, I have to know beforehand what I'm looking for and this is where I'm kind of lost. I'm not really sure where to start.
Basically I wanna know about the following:

What are the prerequisites?
(I'm currently trained in Linear Algebra, Calculus, Complex Analysis - all on an undergraduate level )
Can you recommend some reading materials? 

Thank you.

One of the best is An Introduction to the Theory of Numbers by Niven, Zuckerman, and Montgomery.
