Welcome to the numbers book dictionary

This page will tell you almost everything there is to know about the number: 13
So lets start with some basic information:

Number 13


The number 13 is a Positive and Odd number. it's Inverse number is 0.076923076923077 and it's Counter number is -13. The number 13 can be divided by 1 ,13 without remainder of course. In addition, it's not a Perfect square and it's a Prime number.Now Let's use some trigonometric functions just for fun... Using the Sine Fuction: Sin(13°) gives 0.420, using the Cosine Function Cos(13°) gives 0.907 and using the Tangent Function tan(13°) gives 0.463.


13 contains 2 digits that summed up to 4. .In English this number should sounds like: thirteen. In addition, the digits that represents the number 13 are: one ,three.
The number 13 is a decimal number and it means that it represented in base 10. 13 can also be represented In different bases such as base two, that also known as Binary and looks like: 1101, base 8, that also known as Octal and looks like 15 and base 16, that also known as Hexadecimal and looks like: d. These are the the most common bases but of course, there are much more bases.

Possible Meanings for the number:

This number can represent an IP address such as: This number can also represents a webcolor like : #000013
Previous number 12
Binary (base two):1101
Octal (base 8):15
Hexadecimal (base 16):d
Divisible by: 1 ,13
Factorial number:6227020800
Number of digits:2
Prime Factorization:13
Sum of digits: 4
This number can be ip :
Next number 14
Even / Odd:Odd
Unix Timestamp:Thu Jan 1 0:00:13 1970
Perfect square:NO
Positive / Negative:Positive
English digits:one ,three
Sin: 0.420
Cos: 0.907
Tan: 0.463
Color Number: #000013
Fibonacci number:YES

Do you have any other meaning for this number?
share it! tell us what you have on this special number:

The number is the seventh prime number, and seven is considered lucky.

Updated at : 14/02/2016

Considered very lucky to some.

Updated at : 02/02/2016

considered unlucky

Updated at : 19/10/2015