# 19

## Nearby Numbers

Positive, nonzero integers within three units

16
Sixteen
17
Seventeen
18
Eightteen
20
Twenty
21
Twenty-One
22
Twenty-Two

## 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.

### `0.05263157894736842`

The reciprocal of 19.

## Palindrome?

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

The number 19 is not a palindrome.

## A Prime Number

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

Nineteen is the 8th prime number.   See primes in Base 10 Decimal

## Not A Composite

Composites have more than just these two factors.

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

## Prime Factors

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

The number nineteen has the following 1 prime factor:

19
Nineteen

## Prime Factorization

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

## Base Conversions

The number nineteen in 35 different bases