For a three-digit number, the sum of the digits is equal to the sum of the digits of its square root, and the product of the digits of this three-digit number is 1 less than its square root. What is this three-digit number?
一个三位数，各位数字相加之和等于他的平方根的各位数字相加的和，这个三位数的各位数字的乘积比它的平方根小1．这个三位数是多少？
<gadget id="calculator">19 ** 2</gadget>
<output>361</output>

<result>361</result>