Square Numbers
      - Puzzle -

11, 13, 23, 36, 81,  ?

While studying the concept of square numbers, Neha came across a question that she couldn't solve by herself. Could you help her by finding the missing number below? 


From the given number, take the squares of each digit and add them to the actual number.
From the given sequence:
Consider 11 --- Square of 1 is 1. Now add 11+1+1 to get the next term i.e, 13.

Same follows for all the remaining numbers in the series.
Consider 81 --- 8 square is 64 and 1 square is 1. Now add 81+64+1 to get the next term i.e, 146.