The number 4081
4081 is a composite number with 8 divisors. Its prime factorisation is 7 × 11 × 53. Divisors (8): 1, 7, 11, 53, 77, 371, 583, 4081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
4081 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
4081 is composite. Its prime factorisation is
- 3
The divisors add up to 5184; without 4081 itself that is 1103, so 4081 is deficient (1103 is less than 4081). Euler's totient φ(4081) = 3120 numbers up to 4081 share no factor with it.
- 4
The digits of 4081 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 51 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4081 = 7 \times 11 \times 53 \]
4081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 5184 |
| Euler totient φ(n) | 3120 |
| Square | 16654561 |
| Cube | 67967263441 |
| Square root | 63.882705 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 51 |
| Scientific notation | 4.081 × |
4081 in other forms
| Form | Value |
|---|---|
| In words | four thousand and eighty-one |
| Binary (base 2) | 111111110001 |
| Octal (base 8) | 7761 |
| Hexadecimal (base 16) | FF1 |
| Base 3 | 12121011 |
| As time | 4081 seconds = 1 h 8 min 1 s |
Is 4081 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 (4081 ÷ 7 = 583) | 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 4) | 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 (4081 ÷ 11 = 371) | 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 4081 a prime number?
No. 4081 = 7 × 11 × 53, so it is divisible by 7.
What are the factors of 4081?
1, 7, 11, 53, 77, 371, 583, 4081.
What is 4081 in binary?
111111110001 (hexadecimal FF1, octal 7761).
What is the square root of 4081?
About 63.8827.
Is 4081 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 4081?
It is a composite number with 8 divisors.