The number 43081
43081 is a composite number with 4 divisors. Its prime factorisation is 67 × 643. Divisors (4): 1, 67, 643, 43081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 43081: a semiprime: 67 × 643, the product of two primes.
- 2
43081 is composite. Its prime factorisation is
- 3
The divisors add up to 43792; without 43081 itself that is 711, so 43081 is deficient (711 is less than 43081). Euler's totient φ(43081) = 42372 numbers up to 43081 share no factor with it.
- 4
The digits of 43081 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 106 steps to reach 1.
LaTeX source of the formulas on this page
\[ 43081 = 67 \times 643 \]
43081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43792 |
| Euler totient φ(n) | 42372 |
| Square | 1855972561 |
| Cube | 79957153900441 |
| Square root | 207.559630 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 106 |
| Scientific notation | 4.3081 × |
43081 in other forms
| Form | Value |
|---|---|
| In words | forty-three thousand and eighty-one |
| Binary (base 2) | 1010100001001001 |
| Octal (base 8) | 124111 |
| Hexadecimal (base 16) | A849 |
| Base 3 | 2012002121 |
| As time | 43081 seconds = 11 h 58 min 1 s |
Is 43081 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 | No (remainder 3) | 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 7) | 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 | No (remainder 5) | 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 43081 a prime number?
No. 43081 = 67 × 643, so it is divisible by 67.
What are the factors of 43081?
1, 67, 643, 43081.
What is 43081 in binary?
1010100001001001 (hexadecimal A849, octal 124111).
What is the square root of 43081?
About 207.5596.
Is 43081 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 43081?
43081 is a semiprime: 67 × 643, the product of two primes.