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 |
| 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 number |
| Is 1681 a triangle number? | 1681 is NOT a triangle number |
1681 in other Bases
| Base 2 (Binary) | 110100100012 |
| Base 3 (Ternary) | 20220213 |
| Base 4 (Quaternary) | 1221014 |
| Base 5 (Quinary) | 232115 |
| Base 6 (Senary) | 114416 |
| Base 8 (Octal) | 32218 |
| Base 12 (Duodecimal) | B8112 |
| Base 16 (Hexadecimal) | 69116 |
| Base 20 (Vigesimal) | 44120 |
Primes and Factors tests for 1681
| Is 1681 a Prime Number? | 1681 is NOT a prime |
| 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 |
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1681 in other Numerals
| 1681 in Roman Numeral | MDCLXXXI |
| 1681 in Chinese Numeral | 壹仟陸佰捌拾壹 |
| 1681 in Egyptian Numeral | 𓆼𓍧𓎍𓏺 |
| 1681 in Babylonian Numeral |   |
Roots and stuff 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 the number 1681 | 41 |
| Cube root of the number 1681 | 11.890202136873 |
Recreational math for 1681
| Number 1681 reversed | 1861 |
| Sum of the digits | 16 |
| No of digits | 4 |