There are a number of languages spoken in Iran (see the related link below) which one do you mean?
In ordinary writing, the numbers one through ten are written as words. Higher numbers are written as numbers.A sentence should not start with a numeral, so write out the number (or reword the sentence).
How do you write thirty-one million in numbers
One millionth in numbers = 0.000001
You write a bar above one or more numbers (you have to write it after one or more numbers or the decimal).It repeats.
$1090 - one thousand and ninety $1009 - one thousand and nine
banana2
1,000,000,000,000
1,000,000,000
1000
one million dollars in numbers = $1,000,000
1,001,000
1001