The number 13081
13081 is a composite number with 4 divisors. Its prime factorisation is 103 × 127. Divisors (4): 1, 103, 127, 13081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 13081: a semiprime: 103 × 127, the product of two primes.
- 2
13081 is composite. Its prime factorisation is
- 3
The divisors add up to 13312; without 13081 itself that is 231, so 13081 is deficient (231 is less than 13081). Euler's totient φ(13081) = 12852 numbers up to 13081 share no factor with it.
- 4
The digits of 13081 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 169 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13081 = 103 \times 127 \]
13081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 13312 |
| Euler totient φ(n) | 12852 |
| Square | 171112561 |
| Cube | 2238323410441 |
| Square root | 114.372199 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 169 |
| Scientific notation | 1.3081 × |
13081 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand and eighty-one |
| Binary (base 2) | 11001100011001 |
| Octal (base 8) | 31431 |
| Hexadecimal (base 16) | 3319 |
| Base 3 | 122221111 |
| As time | 13081 seconds = 3 h 38 min 1 s |
Is 13081 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 5) | 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 | No (remainder 2) | 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 13081 a prime number?
No. 13081 = 103 × 127, so it is divisible by 103.
What are the factors of 13081?
1, 103, 127, 13081.
What is 13081 in binary?
11001100011001 (hexadecimal 3319, octal 31431).
What is the square root of 13081?
About 114.3722.
Is 13081 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 13081?
13081 is a semiprime: 103 × 127, the product of two primes.