2, 3, 5, 9, 17, _ What is the next number in the sequence?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Replace the question mark with the correct number in below Picture:

How many times can you subtract the number two from the number fifty?

What always comes into a house through the keyhole?

Can you write down eight eights so that they add up to one thousand?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?