# 31

## Nearby Numbers

Positive, nonzero integers within three units

28
Twenty-Eight
29
Twenty-Nine
30
Thirty
32
Thirty-Two
33
Thirty-Three
34
Thirty-Four

## Scientific Notation

Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.

## Reciprocal

A number multiplied with its reciprocal is one.

### `0.03225806451612903`

The reciprocal of 31.

## Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 31 is not a palindrome.

## A Prime Number

A prime number is a positive integer that is divisible only by itself and one.

Thirty-one is the 11th prime number.   See primes in Base 10 Decimal

## Not A Composite

Composites have more than just these two factors.

Thirty-One is not a composite number because it has exactly two factors: One and Thirty-One

## Prime Factors

The prime factors of a positive integer are the integers that divide it exactly and are also prime.

The number thirty-one has the following 1 prime factor:

31
Thirty-One

## Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

## Base Conversions

The number thirty-one in 35 different bases