The number 6809
6809 is a composite number with 4 divisors. Its prime factorisation is 11 × 619. Divisors (4): 1, 11, 619, 6809.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 6809: a semiprime: 11 × 619, the product of two primes.
- 2
6809 is composite. Its prime factorisation is
- 3
The divisors add up to 7440; without 6809 itself that is 631, so 6809 is deficient (631 is less than 6809). Euler's totient φ(6809) = 6180 numbers up to 6809 share no factor with it.
- 4
The digits of 6809 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 181 steps to reach 1.
LaTeX source of the formulas on this page
\[ 6809 = 11 \times 619 \]
6809 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 7440 |
| Euler totient φ(n) | 6180 |
| Square | 46362481 |
| Cube | 315682133129 |
| Square root | 82.516665 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 181 |
| Scientific notation | 6.809 × |
6809 in other forms
| Form | Value |
|---|---|
| In words | six thousand eight hundred and nine |
| Binary (base 2) | 1101010011001 |
| Octal (base 8) | 15231 |
| Hexadecimal (base 16) | 1A99 |
| Base 3 | 100100012 |
| As time | 6809 seconds = 1 h 53 min 29 s |
Is 6809 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (6809 ÷ 11 = 619) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 6809 a prime number?
No. 6809 = 11 × 619, so it is divisible by 11.
What are the factors of 6809?
1, 11, 619, 6809.
What is 6809 in binary?
1101010011001 (hexadecimal 1A99, octal 15231).
What is the square root of 6809?
About 82.5167.
Is 6809 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 6809?
6809 is a semiprime: 11 × 619, the product of two primes.