Figurate numbers have a rich history with many applications. The main purpose of this book is to provide a thorough and complete presentation of the theory of figurate numbers, giving much of their properties, facts and theorems with full proofs. This book is the first of this topic written in unified systematic way. It also contains many exercises with solutions.Contents:Plane Figurate NumbersSpace Figurate NumbersMultidimensional Figurate NumbersAreas of Number Theory including Figurate NumbersFermat's Polygonal Number TheoremZoo of Figurate-related NumbersReadership: Advanced undergraduate, graduate students and researchers in number theory.