- One is the first non-zero natural number.
- It is an odd number.
- One is the first positive integer.
- It is the only natural number that is neither prime nor composite.
- One is the only positive integer divisible by only one positive integer. Rest all numbers are divisible by two or more than two integers.
- Any non-zero number multiplied by one remains that number. One is identity for multiplication.
- Any non-zero number divided by number one remains that number.
- Any non-zero number multiplied by its inverse gives one as a result. (Multiplicative Inverse)
- The number one, raised to any power, equals one only.
- Any non-zero number raised to power one, does not change the value of that number. It remains that number.
- Any non-zero number divided by itself yields one.
- One is its own factorial.
- One is its own square and square root.
- One is its own cube and cube root.
- One is a Regular number.
- One is also a Fibonacci number.
- One is not a perfect number.
- One is the probability of an event that is almost certain to occur.
- Natural logarithm of one is zero.
- Decimal logarithm of one is zero.
- One is the only number written in the reverse alphabetical sequence of letters. O – N – E.
