The number 81367
81367 is a composite number with 8 divisors. Its prime factorisation is 11 × 13 × 569. Divisors (8): 1, 11, 13, 143, 569, 6259, 7397, 81367.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
81367 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
81367 is composite. Its prime factorisation is
- 3
The divisors add up to 95760; without 81367 itself that is 14393, so 81367 is deficient (14393 is less than 81367). Euler's totient φ(81367) = 68160 numbers up to 81367 share no factor with it.
- 4
The digits of 81367 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 120 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81367 = 11 \times 13 \times 569 \]
81367 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 95760 |
| Euler totient φ(n) | 68160 |
| Square | 6620588689 |
| Cube | 538697439857863 |
| Square root | 285.249014 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 120 |
| Scientific notation | 8.1367 × |
81367 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand three hundred and sixty-seven |
| Binary (base 2) | 10011110111010111 |
| Octal (base 8) | 236727 |
| Hexadecimal (base 16) | 13DD7 |
| Base 3 | 11010121121 |
| As time | 81367 seconds = 22 h 36 min 7 s |
Is 81367 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 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (81367 ÷ 11 = 7397) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 81367 a prime number?
No. 81367 = 11 × 13 × 569, so it is divisible by 11.
What are the factors of 81367?
1, 11, 13, 143, 569, 6259, 7397, 81367.
What is 81367 in binary?
10011110111010111 (hexadecimal 13DD7, octal 236727).
What is the square root of 81367?
About 285.2490.
Is 81367 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 81367?
It is a composite number with 8 divisors.