The number 31318
31318 is a composite number with 8 divisors. Its prime factorisation is 2 × 7 × 2237. Divisors (8): 1, 2, 7, 14, 2237, 4474, 15659, 31318.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31318 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31318 is composite. Its prime factorisation is
- 3
The divisors add up to 53712; without 31318 itself that is 22394, so 31318 is deficient (22394 is less than 31318). Euler's totient φ(31318) = 13416 numbers up to 31318 share no factor with it.
- 4
The digits of 31318 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 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31318 = 2 \times 7 \times 2237 \]
31318 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 53712 |
| Euler totient φ(n) | 13416 |
| Square | 980817124 |
| Cube | 30717230689432 |
| Square root | 176.968924 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1318 × |
31318 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand three hundred and eighteen |
| Binary (base 2) | 111101001010110 |
| Octal (base 8) | 75126 |
| Hexadecimal (base 16) | 7A56 |
| Base 3 | 1120221221 |
| As time | 31318 seconds = 8 h 41 min 58 s |
Is 31318 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31318 ÷ 2 = 15659) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (31318 ÷ 7 = 4474) | 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 6) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31318 a prime number?
No. 31318 = 2 × 7 × 2237, so it is divisible by 2.
What are the factors of 31318?
1, 2, 7, 14, 2237, 4474, 15659, 31318.
What is 31318 in binary?
111101001010110 (hexadecimal 7A56, octal 75126).
What is the square root of 31318?
About 176.9689.
Is 31318 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 31318?
It is a composite number with 8 divisors.