45
Everything about the number 45 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 45
| Nominal | 45 |
| Cardinal | forty-five |
| Ordinal | 45th |
| This number as US currency | forty-five dollars |
Properties (and some facts) of 45
| Is 45 an odd number? | 45 is an odd number |
| Is 45 an even number? | 45 is not an even number |
| Is 45 a palindrome? | 45 is not a palindrome |
| Is 45 a triangle number? | 45 is a triangle number |
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45 in other bases
| Base 2 (Binary) | 101101 |
| Base 3 (Ternary) | 1200 |
| Base 4 (Quaternary) | 231 |
| Base 5 (Quinary) | 140 |
| Base 6 (Senary) | 113 |
| Base 8 (Octal) | 55 |
| Base 12 (Duodecimal) | 39 |
| Base 16 (Hexadecimal) | 2D |
| Base 20 (Vigesimal) | 25 |
Primes and factors tests for 45
| Is 45 a prime number? | 45 is not a prime number |
| Is 45 a perfect number? | 45 is not a perfect number |
| Is 45 a Mersenne prime? | 45 is not a Mersenne prime |
| Is 45 a Fermat prime? | 45 is not a Fermat prime |
| Is 45 a Fibonacci prime? | 45 is not a Fibonacci prime |
| Is 45 a partition prime? | 45 is not a partition prime |
| Is 45 a Pell prime? | 45 is not a Pell prime |
| Prime Factors | Prime factors of 45 |
45 in other numeral systems
| 45 in Roman numerals | XLV |
| 45 in Chinese numerals | 肆拾伍 |
| 45 in Babylonian numerals |  |
| 45 in Egyptian numerals | 𓎉𓏾 |
Roots and squares for 45
| Is 45 a square number? | 45 is not a square number |
| Is 45 a cube number? | 45 is not a cube number |
| Square root of 45 | 6.7082039324994 |
| Cube root of 45 | 3.5568933044901 |
Recreational math for 45
| Number 45 reversed | 54 |
| Sum of the digits | 9 |
| Number of digits | 2 |
Arithmetic tables for 45
Other pages about 45
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