2
Everything about the number 2 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 2
| Nominal | 2 |
| Cardinal | two |
| Ordinal | 2nd |
| This number as US currency | two dollars |
Properties (and some facts) of 2
| Is 2 an odd number? | 2 is not an odd number |
| Is 2 an even number? | 2 is an even number |
| Is 2 a palindrome? | 2 is a palindrome |
| Is 2 a triangle number? | 2 is not a triangle number |
| Factorial (2!) of the number 2 | 2 |
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2 in other bases
| Base 2 (Binary) | 10 |
| Base 3 (Ternary) | 2 |
| Base 4 (Quaternary) | 2 |
| Base 5 (Quinary) | 2 |
| Base 6 (Senary) | 2 |
| Base 8 (Octal) | 2 |
| Base 12 (Duodecimal) | 2 |
| Base 16 (Hexadecimal) | 2 |
| Base 20 (Vigesimal) | 2 |
Primes and factors tests for 2
| Is 2 a prime number? | 2 is a prime number |
| Is 2 a perfect number? | 2 is not a perfect number |
| Is 2 a Mersenne prime? | 2 is not a Mersenne prime |
| Is 2 a Fermat prime? | 2 is not a Fermat prime |
| Is 2 a Fibonacci prime? | 2 is a Fibonacci prime |
| Is 2 a partition prime? | 2 is a partition prime |
| Is 2 a Pell prime? | 2 is a Pell prime |
| Prime Factors | Prime factors of 2 |
2 in other numeral systems
| 2 in Roman numerals | II |
| 2 in Chinese numerals | 貳 |
| 2 in Babylonian numerals |  |
| 2 in Egyptian numerals | 𓏻 |
Roots and squares for 2
| Is 2 a square number? | 2 is not a square number |
| Is 2 a cube number? | 2 is not a cube number |
| Square root of 2 | 1.4142135623731 |
| Cube root of 2 | 1.2599210498949 |
Recreational math for 2
| Number 2 reversed | 2 |
| Sum of the digits | 2 |
| Number of digits | 1 |
Arithmetic tables for 2
Other pages about 2
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