1

1 is the natural successor of 0 and is the first positive integer. In most set theories it is written as or {Ø}.

properties
Any number multiplied by 1 equals the number itself

any number divided by itself equals 1

all integers are divisible by 1

1 is the only number with a single divisor

1 is the only odd practical number

All numbers >1 are large numbers according to sbiis saibian