The Number 3131 is a Prime Number.
31 is a Mersenne Number.
31 is a Centered Triangular Number.
31 is a Centered Pentagonal Number.
31 is a Centered Decagonal Number.
There are only 31 numbers which cannot be expressed as the sum of distinct squares.
31 is the number of moves required in a Tower of Hanoi Puzzle containing 5 discs.
31 can be Partitioned 6842 ways.
The number of regular polygons with an odd number of sides that can be constructed with straightedge and compass = 31.
The Chemical Element Gallium has an atomic number of 31.
Pradjapati created the universe by articulating the odd numbers from 1 to 31, according to the Vajasaneya Samhita - white Yajur.
In Buddhism, there are 31 planes of existence.
The Year 31 ADIn the year 31 AD Musonius Rufus, Roman philosopher was born.