The number 27181
27181 is a composite number with 8 divisors. Its prime factorisation is 7 × 11 × 353. Divisors (8): 1, 7, 11, 77, 353, 2471, 3883, 27181.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
27181 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
27181 is composite. Its prime factorisation is
- 3
The divisors add up to 33984; without 27181 itself that is 6803, so 27181 is deficient (6803 is less than 27181). Euler's totient φ(27181) = 21120 numbers up to 27181 share no factor with it.
- 4
The digits of 27181 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 38 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27181 = 7 \times 11 \times 353 \]
27181 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 33984 |
| Euler totient φ(n) | 21120 |
| Square | 738806761 |
| Cube | 20081506570741 |
| Square root | 164.866613 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 38 |
| Scientific notation | 2.7181 × |
27181 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand one hundred and eighty-one |
| Binary (base 2) | 110101000101101 |
| Octal (base 8) | 65055 |
| Hexadecimal (base 16) | 6A2D |
| Base 3 | 1101021201 |
| As time | 27181 seconds = 7 h 33 min 1 s |
Is 27181 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | 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 | Yes (27181 ÷ 7 = 3883) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (27181 ÷ 11 = 2471) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 27181 a prime number?
No. 27181 = 7 × 11 × 353, so it is divisible by 7.
What are the factors of 27181?
1, 7, 11, 77, 353, 2471, 3883, 27181.
What is 27181 in binary?
110101000101101 (hexadecimal 6A2D, octal 65055).
What is the square root of 27181?
About 164.8666.
Is 27181 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 27181?
It is a composite number with 8 divisors.