The number 31165
31165 is a composite number with 8 divisors. Its prime factorisation is 5 × 23 × 271. Divisors (8): 1, 5, 23, 115, 271, 1355, 6233, 31165.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31165 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31165 is composite. Its prime factorisation is
- 3
The divisors add up to 39168; without 31165 itself that is 8003, so 31165 is deficient (8003 is less than 31165). Euler's totient φ(31165) = 23760 numbers up to 31165 share no factor with it.
- 4
The digits of 31165 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 72 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31165 = 5 \times 23 \times 271 \]
31165 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 39168 |
| Euler totient φ(n) | 23760 |
| Square | 971257225 |
| Cube | 30269231417125 |
| Square root | 176.536115 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 72 |
| Scientific notation | 3.1165 × |
31165 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand one hundred and sixty-five |
| Binary (base 2) | 111100110111101 |
| Octal (base 8) | 74675 |
| Hexadecimal (base 16) | 79BD |
| Base 3 | 1120202021 |
| As time | 31165 seconds = 8 h 39 min 25 s |
Is 31165 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (31165 ÷ 5 = 6233) | 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 1) | 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 7) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31165 a prime number?
No. 31165 = 5 × 23 × 271, so it is divisible by 5.
What are the factors of 31165?
1, 5, 23, 115, 271, 1355, 6233, 31165.
What is 31165 in binary?
111100110111101 (hexadecimal 79BD, octal 74675).
What is the square root of 31165?
About 176.5361.
Is 31165 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 31165?
It is a composite number with 8 divisors.