Corners of a Number Spiral

The integers from 00 to 10000001000000 are written in order in a spiral pattern, as shown below.

6789501104321115141312\begin{array}{cccccccc} 6 &\rightarrow & 7 &\rightarrow & 8 & \rightarrow & 9\\ \uparrow&&&&&&\downarrow\\ 5 && 0 & \rightarrow & 1 & &10\\ \uparrow&&&&\downarrow&&\downarrow\\ 4 & \leftarrow & 3 & \leftarrow & 2&&11\\ &&&&&&\downarrow\\ 15 & \leftarrow & 14 & \leftarrow & 13&\leftarrow&12\\ \end{array}

A number is considered to be in a bottom-right corner if it has a downward arrow pointing into it and a leftward pointing arrow coming out of it. As we can see from the spiral, the first bottom-right corner number is 2 and the second is 12. What is the 1515th bottom-right corner number?

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