The number 47315
47315 is a composite number with 4 divisors. Its prime factorisation is 5 × 9463. Divisors (4): 1, 5, 9463, 47315.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47315: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 5 × 9463, the product of two primes.
- 2
47315 is composite. Its prime factorisation is
- 3
The divisors add up to 56784; without 47315 itself that is 9469, so 47315 is deficient (9469 is less than 47315). Euler's totient φ(47315) = 37848 numbers up to 47315 share no factor with it.
- 4
The digits of 47315 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47315 = 5 \times 9463 \]
47315 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56784 |
| Euler totient φ(n) | 37848 |
| Square | 2238709225 |
| Cube | 105924526980875 |
| Square root | 217.520114 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 83 |
| Scientific notation | 4.7315 × |
47315 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand three hundred and fifteen |
| Binary (base 2) | 1011100011010011 |
| Octal (base 8) | 134323 |
| Hexadecimal (base 16) | B8D3 |
| Base 3 | 2101220102 |
| As time | 47315 seconds = 13 h 8 min 35 s |
Is 47315 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 | Yes (47315 ÷ 5 = 9463) | 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 2) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | 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 47315 a prime number?
No. 47315 = 5 × 9463, so it is divisible by 5.
What are the factors of 47315?
1, 5, 9463, 47315.
What is 47315 in binary?
1011100011010011 (hexadecimal B8D3, octal 134323).
What is the square root of 47315?
About 217.5201.
Is 47315 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 47315?
47315 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 5 × 9463, the product of two primes.