The number 318
318 is a composite number with 8 divisors. Its prime factorisation is 2 × 3 × 53. Divisors (8): 1, 2, 3, 6, 53, 106, 159, 318.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
318 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
318 is composite. Its prime factorisation is
- 3
The divisors add up to 648; without 318 itself that is 330, so 318 is abundant (330 is more than 318). Euler's totient φ(318) = 104 numbers up to 318 share no factor with it.
- 4
The digits of 318 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 55 steps to reach 1.
LaTeX source of the formulas on this page
\[ 318 = 2 \times 3 \times 53 \]
318 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 648 |
| Euler totient φ(n) | 104 |
| Square | 101124 |
| Cube | 32157432 |
| Square root | 17.832555 |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 55 |
| Scientific notation | 3.18 × |
318 in other forms
| Form | Value |
|---|---|
| In words | three hundred and eighteen |
| Roman numerals | CCCXVIII |
| Binary (base 2) | 100111110 |
| Octal (base 8) | 476 |
| Hexadecimal (base 16) | 13E |
| Base 3 | 102210 |
| As time | 318 seconds = 5 min 18 s |
Is 318 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (318 ÷ 2 = 159) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (318 ÷ 3 = 106) | 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 | Yes (318 ÷ 6 = 53) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 3) | 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 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 318 a prime number?
No. 318 = 2 × 3 × 53, so it is divisible by 2.
What are the factors of 318?
1, 2, 3, 6, 53, 106, 159, 318.
What is 318 in binary?
100111110 (hexadecimal 13E, octal 476).
What is the square root of 318?
About 17.8326.
What is 318 in Roman numerals?
CCCXVIII.
Is 318 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 318?
It is a composite number with 8 divisors.