# 10100012

The numbers with a 2 subscript use Base 2 Binary notation.

For more familiar numbers: See Eighty-One in Base 10 Decimal

## Nearby Numbers

Positive, nonzero integers within three units

78
10011102
Seventy-Eight in Base 2 Binary
79
10011112
Seventy-Nine in Base 2 Binary
80
10100002
Eighty in Base 2 Binary
82
10100102
Eighty-Two in Base 2 Binary
83
10100112
Eighty-Three in Base 2 Binary
84
10101002
Eighty-Four in Base 2 Binary

## 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.

### `0.0000001100101001000101100001111110011010110111010011112`

The reciprocal of 81 in Base 2 Binary.

## Palindrome?

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

The number 10100012 is not a palindrome.

## Not A Prime Number

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

Eighty-one is a composite number with 5 total factors (including 1 and itself).   See primes in Base 2 Binary

## A Composite

Composites have more than just these two factors.

Eighty-one is a composite number with 5 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 eighty-one has the following 1 prime factor:

3
112
Three in Base 2 Binary

## Prime Factorization

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

## Base Conversions

The number eighty-one in 35 different bases