# 91

## Nearby Numbers

Positive, nonzero integers within three units

88
Eighty-Eight
89
Eighty-Nine
90
Ninety
92
Ninety-Two
93
Ninety-Three
94
Ninety-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.

### `0.01098901098901099`

The reciprocal of 91.

## Palindrome?

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

The number 91 is not a palindrome.

## Not A Prime Number

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

Ninety-one is a composite number with 4 total factors (including 1 and itself).   See primes in Base 10 Decimal

## A Composite

Composites have more than just these two factors.

Ninety-one is a composite number with 4 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-one has the following 2 prime factors:

7
Seven
13
Thirteen

## Prime Factorization

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

## Base Conversions

The number ninety-one in 35 different bases