The number 10081
10081 is a composite number with 4 divisors. Its prime factorisation is 17 × 593. Divisors (4): 1, 17, 593, 10081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 10081: a semiprime: 17 × 593, the product of two primes.
- 2
10081 is composite. Its prime factorisation is
- 3
The divisors add up to 10692; without 10081 itself that is 611, so 10081 is deficient (611 is less than 10081). Euler's totient φ(10081) = 9472 numbers up to 10081 share no factor with it.
- 4
The digits of 10081 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 86 steps to reach 1.
LaTeX source of the formulas on this page
\[ 10081 = 17 \times 593 \]
10081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 10692 |
| Euler totient φ(n) | 9472 |
| Square | 101626561 |
| Cube | 1024497361441 |
| Square root | 100.404183 |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 86 |
| Scientific notation | 1.0081 × |
10081 in other forms
| Form | Value |
|---|---|
| In words | ten thousand and eighty-one |
| Binary (base 2) | 10011101100001 |
| Octal (base 8) | 23541 |
| Hexadecimal (base 16) | 2761 |
| Base 3 | 111211101 |
| As time | 10081 seconds = 2 h 48 min 1 s |
Is 10081 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 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 1) | 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 | 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 10081 a prime number?
No. 10081 = 17 × 593, so it is divisible by 17.
What are the factors of 10081?
1, 17, 593, 10081.
What is 10081 in binary?
10011101100001 (hexadecimal 2761, octal 23541).
What is the square root of 10081?
About 100.4042.
Is 10081 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 10081?
10081 is a semiprime: 17 × 593, the product of two primes.