Do you think you know everything about the number 9? Here you can test your knowledge about this number, and find out if they are correct, or if you still had things to know about the number 9. Do not know what can be useful to know the characteristics of the number 9? Think about how many times you use numbers in your daily life, surely there are more than you thought. Knowing more about the number 9 will help you take advantage of all that this number can offer you.

9 is a natural number (hence integer, rational and real) of 1 digits that follows 8 and precedes 10.

9 is an even number, since it is divisible by 2.

The number 9 is a unique number, with its own characteristics that, for some reason, has caught your attention. It is logical, we use numbers every day, in multiple ways and almost without realizing it, but knowing more about the number 9 can help you benefit from that knowledge, and be of great use. If you keep reading, we will give you all the facts you need to know about the number 9, you will see how many of them you already knew, but we are sure you will also discover some new ones.

Number 9 in English is written asnine

The number 9 is pronounced digit by digit as (9) nine.

The number 9 has 3 divisors, they are as follows:

The sum of its divisors, excluding the number itself is 4, so it is a defective number and its abundance is -5The factorization into prime factors of 9 is:

3^{2}

The square root of 9 is. 3

The square of 9, the result of multiplying 9*9 is. 81

The decimal number 9 into binary numbers is.1001

The decimal number 9 in octal numbers is11

The decimal number 9 in hexadecimal numbers is9

The neperian or natural logarithm of 9 is.2.1972245773362

The base 10 logarithm of 9 is0.95424250943932

The sine of 9 radians is.0.41211848524176

The cosine of 9 radians is. -0.91113026188468

The tangent of 9 radians is.-0.45231565944181

Surely there are many things about the number 9 that you already knew, others you have discovered on this website. Your curiosity about the number 9 says a lot about you. That you have researched to know in depth the properties of the number 9 means that you are a person interested in understanding your surroundings. Numbers are the alphabet with which mathematics is written, and mathematics is the language of the universe. To know more about the number 9 is to know the universe better. On this page we have for you many facts about numbers that, properly applied, can help you exploit all the potential that the number 9 has to explain what surrounds us..