When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Why 1729 is a magic number? Answer Logically.

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

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

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?