The number 12731
12731 is a composite number with 4 divisors. Its prime factorisation is 29 × 439. Divisors (4): 1, 29, 439, 12731.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 12731: a semiprime: 29 × 439, the product of two primes.
- 2
12731 is composite. Its prime factorisation is
- 3
The divisors add up to 13200; without 12731 itself that is 469, so 12731 is deficient (469 is less than 12731). Euler's totient φ(12731) = 12264 numbers up to 12731 share no factor with it.
- 4
The digits of 12731 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 12731 = 29 \times 439 \]
12731 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 13200 |
| Euler totient φ(n) | 12264 |
| Square | 162078361 |
| Cube | 2063419613891 |
| Square root | 112.831733 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 138 |
| Scientific notation | 1.2731 × |
12731 in other forms
| Form | Value |
|---|---|
| In words | twelve thousand seven hundred and thirty-one |
| Binary (base 2) | 11000110111011 |
| Octal (base 8) | 30673 |
| Hexadecimal (base 16) | 31BB |
| Base 3 | 122110112 |
| As time | 12731 seconds = 3 h 32 min 11 s |
Is 12731 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 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | 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 5) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 12731 a prime number?
No. 12731 = 29 × 439, so it is divisible by 29.
What are the factors of 12731?
1, 29, 439, 12731.
What is 12731 in binary?
11000110111011 (hexadecimal 31BB, octal 30673).
What is the square root of 12731?
About 112.8317.
Is 12731 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 12731?
12731 is a semiprime: 29 × 439, the product of two primes.