The number 47109
47109 is a composite number with 8 divisors. Its prime factorisation is 3 × 41 × 383. Divisors (8): 1, 3, 41, 123, 383, 1149, 15703, 47109.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
47109 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47109 is composite. Its prime factorisation is
- 3
The divisors add up to 64512; without 47109 itself that is 17403, so 47109 is deficient (17403 is less than 47109). Euler's totient φ(47109) = 30560 numbers up to 47109 share no factor with it.
- 4
The digits of 47109 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47109 = 3 \times 41 \times 383 \]
47109 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 64512 |
| Euler totient φ(n) | 30560 |
| Square | 2219257881 |
| Cube | 104547019516029 |
| Square root | 217.046078 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 83 |
| Scientific notation | 4.7109 × |
47109 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand one hundred and nine |
| Binary (base 2) | 1011100000000101 |
| Octal (base 8) | 134005 |
| Hexadecimal (base 16) | B805 |
| Base 3 | 2101121210 |
| As time | 47109 seconds = 13 h 5 min 9 s |
Is 47109 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 | Yes (47109 ÷ 3 = 15703) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47109 a prime number?
No. 47109 = 3 × 41 × 383, so it is divisible by 3.
What are the factors of 47109?
1, 3, 41, 123, 383, 1149, 15703, 47109.
What is 47109 in binary?
1011100000000101 (hexadecimal B805, octal 134005).
What is the square root of 47109?
About 217.0461.
Is 47109 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 47109?
It is a composite number with 8 divisors.