The number 47731
47731 is a composite number with 4 divisors. Its prime factorisation is 59 × 809. Divisors (4): 1, 59, 809, 47731.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47731: a semiprime: 59 × 809, the product of two primes.
- 2
47731 is composite. Its prime factorisation is
- 3
The divisors add up to 48600; without 47731 itself that is 869, so 47731 is deficient (869 is less than 47731). Euler's totient φ(47731) = 46864 numbers up to 47731 share no factor with it.
- 4
The digits of 47731 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 127 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47731 = 59 \times 809 \]
47731 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 48600 |
| Euler totient φ(n) | 46864 |
| Square | 2278248361 |
| Cube | 108743072518891 |
| Square root | 218.474255 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 127 |
| Scientific notation | 4.7731 × |
47731 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand seven hundred and thirty-one |
| Binary (base 2) | 1011101001110011 |
| Octal (base 8) | 135163 |
| Hexadecimal (base 16) | BA73 |
| Base 3 | 2102110211 |
| As time | 47731 seconds = 13 h 15 min 31 s |
Is 47731 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 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 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 3) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47731 a prime number?
No. 47731 = 59 × 809, so it is divisible by 59.
What are the factors of 47731?
1, 59, 809, 47731.
What is 47731 in binary?
1011101001110011 (hexadecimal BA73, octal 135163).
What is the square root of 47731?
About 218.4743.
Is 47731 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 47731?
47731 is a semiprime: 59 × 809, the product of two primes.