The number 47131
47131 is a composite number with 4 divisors. Its prime factorisation is 7 × 6733. Divisors (4): 1, 7, 6733, 47131.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47131: a semiprime: 7 × 6733, the product of two primes.
- 2
47131 is composite. Its prime factorisation is
- 3
The divisors add up to 53872; without 47131 itself that is 6741, so 47131 is deficient (6741 is less than 47131). Euler's totient φ(47131) = 40392 numbers up to 47131 share no factor with it.
- 4
The digits of 47131 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 220 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47131 = 7 \times 6733 \]
47131 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 53872 |
| Euler totient φ(n) | 40392 |
| Square | 2221331161 |
| Cube | 104693558949091 |
| Square root | 217.096753 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 220 |
| Scientific notation | 4.7131 × |
47131 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand one hundred and thirty-one |
| Binary (base 2) | 1011100000011011 |
| Octal (base 8) | 134033 |
| Hexadecimal (base 16) | B81B |
| Base 3 | 2101122121 |
| As time | 47131 seconds = 13 h 5 min 31 s |
Is 47131 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 | Yes (47131 ÷ 7 = 6733) | 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 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 7) | 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 47131 a prime number?
No. 47131 = 7 × 6733, so it is divisible by 7.
What are the factors of 47131?
1, 7, 6733, 47131.
What is 47131 in binary?
1011100000011011 (hexadecimal B81B, octal 134033).
What is the square root of 47131?
About 217.0968.
Is 47131 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 47131?
47131 is a semiprime: 7 × 6733, the product of two primes.