To convert the number 653,100 into scientific notation, we express it as a product of a number between 1 and 10 and a power of 10.
The number 653,100 can be written as \( 6.53100 \times 10^5 \) in scientific notation.
Here, the exponent is 5.
Therefore, the value of the exponent when this number is written in scientific notation is 5.