The number 71315
71315 is a composite number with 8 divisors. Its prime factorisation is 5 × 17 × 839. Divisors (8): 1, 5, 17, 85, 839, 4195, 14263, 71315.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71315: a Harshad number: divisible by its digit sum 17.
- 2
71315 is composite. Its prime factorisation is
- 3
The divisors add up to 90720; without 71315 itself that is 19405, so 71315 is deficient (19405 is less than 71315). Euler's totient φ(71315) = 53632 numbers up to 71315 share no factor with it.
- 4
The digits of 71315 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 55 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71315 = 5 \times 17 \times 839 \]
71315 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 90720 |
| Euler totient φ(n) | 53632 |
| Square | 5085829225 |
| Cube | 362695911180875 |
| Square root | 267.048685 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 55 |
| Scientific notation | 7.1315 × |
71315 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand three hundred and fifteen |
| Binary (base 2) | 10001011010010011 |
| Octal (base 8) | 213223 |
| Hexadecimal (base 16) | 11693 |
| Base 3 | 10121211022 |
| As time | 71315 seconds = 19 h 48 min 35 s |
Is 71315 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 (71315 ÷ 5 = 14263) | 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 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 2) | 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 71315 a prime number?
No. 71315 = 5 × 17 × 839, so it is divisible by 5.
What are the factors of 71315?
1, 5, 17, 85, 839, 4195, 14263, 71315.
What is 71315 in binary?
10001011010010011 (hexadecimal 11693, octal 213223).
What is the square root of 71315?
About 267.0487.
Is 71315 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 71315?
71315 is a Harshad number: divisible by its digit sum 17.