<image>Mathematics is everywhere in life. Table (1) is a calendar table for a certain month. Just like in the table, use a rectangular box to enclose 9 numbers.

1. The minimum sum of the nine numbers enclosed in Table (1) is ____;
2. If the sum of the nine numbers enclosed is 126, find the largest of the numbers;
3. Arrange natural numbers 1-2015 according to the method in Table (2). Using the same method as above, frame nine numbers. Can the sum be equal to 2015? Find the middle number of the enclosed box; if not, explain why.