# 209

The numbers with a 9 subscript use Base 9 Nonary notation.

For more familiar numbers: See Eightteen in Base 10 Decimal

## Nearby Numbers

Positive, nonzero integers within three units

15
169
Fifteen in Base 9 Nonary
16
179
Sixteen in Base 9 Nonary
17
189
Seventeen in Base 9 Nonary
19
219
Nineteen in Base 9 Nonary
20
229
Twenty in Base 9 Nonary
21
239
Twenty-One in Base 9 Nonary

## 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.

### `0.0444444444444444449`

The reciprocal of 18 in Base 9 Nonary.

## Palindrome?

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

The number 209 is not a palindrome.

## Not A Prime Number

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

Eightteen is a composite number with 6 total factors (including 1 and itself).   See primes in Base 9 Nonary

## A Composite

Composites have more than just these two factors.

Eightteen is a composite number with 6 total factors (including 1 and itself).

## Prime Factors

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

The number eightteen has the following 2 prime factors:

2
29
Two in Base 9 Nonary
3
39
Three in Base 9 Nonary

## Prime Factorization

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

## Base Conversions

The number eightteen in 35 different bases