Names of 99
| Nominal | 99 |
| Cardinal | ninety-nine |
| Ordinal | 99th |
| This number as US currency | ninety-nine dollars |
| Is 99 an odd number? | 99 is an odd number |
| Is 99 an even number? | 99 is NOT an even number |
| Is 99 a palindrome? | 99 is a palindrome number |
| Is 99 a triangle number? | 99 is NOT a triangle number |
99 in other Bases
| Base 2 (Binary) | 11000112 |
| Base 3 (Ternary) | 102003 |
| Base 4 (Quaternary) | 12034 |
| Base 5 (Quinary) | 3445 |
| Base 6 (Senary) | 2436 |
| Base 8 (Octal) | 1438 |
| Base 12 (Duodecimal) | 8312 |
| Base 16 (Hexadecimal) | 6316 |
| Base 20 (Vigesimal) | 4J20 |
Primes and Factors tests for 99
| Is 99 a Prime Number? | 99 is NOT a prime |
| Is 99 a perfect number? | 99 is NOT a perfect number |
| Is 99 a Mersenne Prime? | 99 is NOT a Mersenne prime |
| Is 99 a Fermat Prime? | 99 is NOT a Fermat prime |
| Is 99 a Fibonacci Prime? | 99 is NOT a Fibonacci prime |
| Is 99 a Partition Prime? | 99 is NOT a Partition prime |
| Is 99 a Pell Prime? | 99 is NOT a Pell prime |
| Prime Factors | Prime factors of 99 |
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99 in other Numerals
| 99 in Roman Numeral | XCIX |
| 99 in Chinese Numeral | 玖拾玖 |
| 99 in Egyptian Numeral | 𓎎𓐂 |
| 99 in Babylonian Numeral |   |
Roots and stuff for 99
| Is 99 a square number? | 99 is NOT a square number |
| Is 99 a cube number? | 99 is NOT a cube number |
| Square root of the number 99 | 9.9498743710662 |
| Cube root of the number 99 | 4.6260650091827 |
Recreational math for 99
| Number 99 reversed | 99 |
| Sum of the digits | 18 |
| No of digits | 2 |