A billion - 109.
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One kilo can be expressed in scientific notation as 10^3.
1 nano = 1 * 10^-9
1.91x104 is one way to write 19,100 in scientific notation.
One way to write 154,155,500 in scientific notation is 1.541555x108.
There are probably about half a dozen ways to write this number in scientific notation, but one way to write it, in scientific notation, is 2.4936061x108.