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

I know a nine-letter word having only one vowel.
Do you ?

Can you solve this picture maths equation?

What are the five permanent members of the UN Security Council?

a) France, Germany, Italy, Japan, United Kingdom
b) Canada, Mexico, Saudi Arabia, Turkey, United Arab Emirates
c) Brazil, India, Nigeria, South Africa, South Korea
d) China, France, Russia, United Kingdom, United States

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

How many letters are in the alphabet?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?