The number 81327
81327 is a composite number with 4 divisors. Its prime factorisation is 3 × 27109. Divisors (4): 1, 3, 27109, 81327.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 81327: a semiprime: 3 × 27109, the product of two primes.
- 2
81327 is composite. Its prime factorisation is
- 3
The divisors add up to 108440; without 81327 itself that is 27113, so 81327 is deficient (27113 is less than 81327). Euler's totient φ(81327) = 54216 numbers up to 81327 share no factor with it.
- 4
The digits of 81327 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 182 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81327 = 3 \times 27109 \]
81327 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 108440 |
| Euler totient φ(n) | 54216 |
| Square | 6614080929 |
| Cube | 537903359712783 |
| Square root | 285.178891 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 182 |
| Scientific notation | 8.1327 × |
81327 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand three hundred and twenty-seven |
| Binary (base 2) | 10011110110101111 |
| Octal (base 8) | 236657 |
| Hexadecimal (base 16) | 13DAF |
| Base 3 | 11010120010 |
| As time | 81327 seconds = 22 h 35 min 27 s |
Is 81327 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 | Yes (81327 ÷ 3 = 27109) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 3) | 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 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 81327 a prime number?
No. 81327 = 3 × 27109, so it is divisible by 3.
What are the factors of 81327?
1, 3, 27109, 81327.
What is 81327 in binary?
10011110110101111 (hexadecimal 13DAF, octal 236657).
What is the square root of 81327?
About 285.1789.
Is 81327 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 81327?
81327 is a semiprime: 3 × 27109, the product of two primes.