1
Everything about the number 1 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 1
| Nominal | 1 |
| Cardinal | one |
| Ordinal | 1st |
| This number as US currency | one dollar |
Properties (and some facts) of 1
| Is 1 an odd number? | 1 is an odd number |
| Is 1 an even number? | 1 is not an even number |
| Is 1 a palindrome? | 1 is a palindrome |
| Is 1 a triangle number? | 1 is a triangle number |
| Factorial (1!) of the number 1 | 1 |
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1 in other bases
| Base 2 (Binary) | 1 |
| Base 3 (Ternary) | 1 |
| Base 4 (Quaternary) | 1 |
| Base 5 (Quinary) | 1 |
| Base 6 (Senary) | 1 |
| Base 8 (Octal) | 1 |
| Base 12 (Duodecimal) | 1 |
| Base 16 (Hexadecimal) | 1 |
| Base 20 (Vigesimal) | 1 |
Primes and factors tests for 1
| Is 1 a prime number? | 1 is not a prime number |
| Is 1 a perfect number? | 1 is not a perfect number |
| Is 1 a Mersenne prime? | 1 is not a Mersenne prime |
| Is 1 a Fermat prime? | 1 is not a Fermat prime |
| Is 1 a Fibonacci prime? | 1 is not a Fibonacci prime |
| Is 1 a partition prime? | 1 is not a partition prime |
| Is 1 a Pell prime? | 1 is not a Pell prime |
| Prime Factors | Prime factors of 1 |
1 in other numeral systems
| 1 in Roman numerals | I |
| 1 in Chinese numerals | 壹 |
| 1 in Babylonian numerals |  |
| 1 in Egyptian numerals | 𓏺 |
Roots and squares for 1
| Is 1 a square number? | 1 is a square number |
| Is 1 a cube number? | 1 is a cube number |
| Square root of 1 | 1 |
| Cube root of 1 | 1 |
Recreational math for 1
| Number 1 reversed | 1 |
| Sum of the digits | 1 |
| Number of digits | 1 |
Arithmetic tables for 1
Other pages about 1
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