### The Number

# 90

## Ninety

## In Base 9 Nonary Is

# 1109

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

For more familiar numbers: See Ninety in Base 10 Decimal

## Nearby Numbers

*Positive, nonzero integers within three units*

## Scientific Notation

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

`9e1`

## Reciprocal

*A number multiplied with its reciprocal is one.*

`0.00808080808080808079`

The reciprocal of 90 in Base 9 Nonary.

## Palindrome?

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

The number 1109 is not a palindrome.

## Not A Prime Number

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

Ninety is a composite number with 12 total factors (including 1 and itself). See primes in Base 9 Nonary

## A Composite

*Composites have more than just these two factors.*

Ninety is a composite number with 12 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 ninety has the following 3 prime factors:

## Prime Factorization

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

###
```
291
·
392
·
591
= 1109
```

## Base Conversions

*The number ninety in 35 different bases*