\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{geometry}
\usepackage{tikz}
\usetikzlibrary{arrows}
\begin{document}
\begin{tikzpicture}[->,>=stealth',sibling distance=10em,every node/.style =
{shape=circle,draw, align=center,top color=blue, bottom color=blue,color =white}]]
\node {9}
child { node {4} 
	child { node {1}  }
	child { node {3} }}
child { node {5} };
\end{tikzpicture}
\end{document}