The number 9

Representation numerals

Greek numeral

θʹ

Arabic numeral

٩

Roman numeral

IX

Maya numeral

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Chinese numeral

Hebrew numeral

ט
Numeral systems
Binary: 1001
Septimal (base 7): 12
Octal: 11
Hexadecimal: 9
Base 24: 9
Factorization
9 = 3 × 3
9 has 3 divisors: 1, 3, 9
Sum of all divisors other than 9: 4
9 = 3 2
9 = 1 + 3 + 5
Sums & differences
Difference of 2 squares: 9 = 52 - 42
Characteristics
9 is a palindromic number in decimal system
9 is a palindromic number in binary system (1001)
Related primes
The 9th prime number is: 23
Previous prime number: 7 — Next prime number: 11
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