Problem #WSP - 000008

Problem

When we write 137 in decimal, we mean $1\cdot {10}^2+3\cdot 10+7\cdot 1$. If we write it instead using powers of 2, we have $137=1\cdot 2^7+0\cdot 2^6+0\cdot 2^5+0\cdot 2^4+1\cdot 2^3+0\cdot 2^2+0\cdot 2^1+1\cdot 2^0$. To tell apart binary representation from decimals, we can use the following notation: $137=(10001001{)}_2$.

What is the number 273 in binary?