What is the smallest number N that has 3 ways of split its square to get the sum divided parts is N?

What is the smallest number N that has 3 at least ways of split its square to get the sum of divided parts is N? Example:

    9 = sqrt(81) = 8+1; 
    82 = sqrt(6724) = 6 + 72 + 4

with 91 we have 2 ways:

    91 = sqrt (8281) = 82+8+1 = 8+2+81