The number 31486
31486 is a composite number with 16 divisors. Its prime factorisation is 2 × 7 × 13 × 173. Divisors (16): 1, 2, 7, 13, 14, 26, 91, 173, 182, 346, 1211, 2249, 2422, 4498, 15743, 31486.
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How to work it out
- 1
31486 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31486 is composite. Its prime factorisation is
- 3
The divisors add up to 58464; without 31486 itself that is 26978, so 31486 is deficient (26978 is less than 31486). Euler's totient φ(31486) = 12384 numbers up to 31486 share no factor with it.
- 4
The digits of 31486 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31486 = 2 \times 7 \times 13 \times 173 \]
31486 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 58464 |
| Euler totient φ(n) | 12384 |
| Square | 991368196 |
| Cube | 31214219019256 |
| Square root | 177.442949 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1486 × |
31486 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and eighty-six |
| Binary (base 2) | 111101011111110 |
| Octal (base 8) | 75376 |
| Hexadecimal (base 16) | 7AFE |
| Base 3 | 1121012011 |
| As time | 31486 seconds = 8 h 44 min 46 s |
Is 31486 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31486 ÷ 2 = 15743) | 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 1) | 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 (31486 ÷ 7 = 4498) | 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 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31486 a prime number?
No. 31486 = 2 × 7 × 13 × 173, so it is divisible by 2.
What are the factors of 31486?
1, 2, 7, 13, 14, 26, 91, 173, 182, 346, 1211, 2249, 2422, 4498, 15743, 31486.
What is 31486 in binary?
111101011111110 (hexadecimal 7AFE, octal 75376).
What is the square root of 31486?
About 177.4429.
Is 31486 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 31486?
It is a composite number with 16 divisors.