When Xiaogang calculated 2.61 and divided it by a number, because the decimal point of the quotient was one more to the right, the result was 4.5. What is the divisor for this division problem?
小刚在计算2.61除以一个数时，由于商的小数点向右多点了一位，结果得4.5．这道除法题的除数是多少？
<gadget id="calculator">2.61 / 0.45</gadget>
<output>5.8</output>

<result>5.8</result>