1681
Everything about the number 1681 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 1681
| Nominal | 1681 |
| Cardinal | one thousand six hundred eighty-one |
| Ordinal | 1,681st |
| This number as US currency | one thousand six hundred eighty-one dollars |
Properties (and some facts) of 1681
| Is 1681 an odd number? | 1681 is an odd number |
| Is 1681 an even number? | 1681 is not an even number |
| Is 1681 a palindrome? | 1681 is not a palindrome |
| Is 1681 a triangle number? | 1681 is not a triangle number |
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1681 in other bases
| Base 2 (Binary) | 11010010001 |
| Base 3 (Ternary) | 2022021 |
| Base 4 (Quaternary) | 122101 |
| Base 5 (Quinary) | 23211 |
| Base 6 (Senary) | 11441 |
| Base 8 (Octal) | 3221 |
| Base 12 (Duodecimal) | B81 |
| Base 16 (Hexadecimal) | 691 |
| Base 20 (Vigesimal) | 441 |
Primes and factors tests for 1681
| Is 1681 a prime number? | 1681 is not a prime number |
| Is 1681 a perfect number? | 1681 is not a perfect number |
| Is 1681 a Mersenne prime? | 1681 is not a Mersenne prime |
| Is 1681 a Fermat prime? | 1681 is not a Fermat prime |
| Is 1681 a Fibonacci prime? | 1681 is not a Fibonacci prime |
| Is 1681 a partition prime? | 1681 is not a partition prime |
| Is 1681 a Pell prime? | 1681 is not a Pell prime |
| Prime Factors | Prime factors of 1681 |
1681 in other numeral systems
| 1681 in Roman numerals | MDCLXXXI |
| 1681 in Chinese numerals | 壹仟陸佰捌拾壹 |
| 1681 in Babylonian numerals |   |
| 1681 in Egyptian numerals | 𓆼𓍧𓎍𓏺 |
Roots and squares for 1681
| Is 1681 a square number? | 1681 is a square number |
| Is 1681 a cube number? | 1681 is not a cube number |
| Square root of 1681 | 41 |
| Cube root of 1681 | 11.890202136873 |
Recreational math for 1681
| Number 1681 reversed | 1861 |
| Sum of the digits | 16 |
| Number of digits | 4 |
Arithmetic tables for 1681
Other pages about 1681
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