The number 125 is a natural number that follows 124 and precedes 126. It is an odd number and can be expressed as the sum of the first ten odd numbers, which makes it a triangular number. In mathematics, 125 is also notable for being a perfect cube, as it can be represented as 5 × 5 × 5 or 5^3. In Roman numerals, 125 is written as CXXV. This number can be found in various contexts, such as in measurements, quantities, and even in historical dates. For example, the year 125 AD is significant in Roman history, marking the reign of Emperor Hadrian.