Names of 9
| Nominal | 9 |
| Cardinal | nine |
| Ordinal | 9th |
| This number as US currency | nine dollars |
| Is 9 an odd number? | 9 is an odd number |
| Is 9 an even number? | 9 is NOT an even number |
| Is 9 a palindrome? | 9 is a palindrome number |
| Is 9 a triangle number? | 9 is NOT a triangle number |
| Factorial (n!) of number 9! | 362880 |
9 in other Bases
| Base 2 (Binary) | 10012 |
| Base 3 (Ternary) | 1003 |
| Base 4 (Quaternary) | 214 |
| Base 5 (Quinary) | 145 |
| Base 6 (Senary) | 136 |
| Base 8 (Octal) | 118 |
| Base 12 (Duodecimal) | 912 |
| Base 16 (Hexadecimal) | 916 |
| Base 20 (Vigesimal) | 920 |
Primes and Factors tests for 9
| Is 9 a Prime Number? | 9 is NOT a prime |
| Is 9 a perfect number? | 9 is NOT a perfect number |
| Is 9 a Mersenne Prime? | 9 is NOT a Mersenne prime |
| Is 9 a Fermat Prime? | 9 is NOT a Fermat prime |
| Is 9 a Fibonacci Prime? | 9 is NOT a Fibonacci prime |
| Is 9 a Partition Prime? | 9 is NOT a Partition prime |
| Is 9 a Pell Prime? | 9 is NOT a Pell prime |
| Prime Factors | Prime factors of 9 |
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9 in other Numerals
| 9 in Roman Numeral | IX |
| 9 in Chinese Numeral | 玖 |
| 9 in Egyptian Numeral | 𓐂 |
| 9 in Babylonian Numeral |  |
Roots and stuff for 9
| Is 9 a square number? | 9 is a square number |
| Is 9 a cube number? | 9 is NOT a cube number |
| Square root of the number 9 | 3 |
| Cube root of the number 9 | 2.0800838230519 |
Recreational math for 9
| Number 9 reversed | 9 |
| Sum of the digits | 9 |
| No of digits | 1 |