The number 31479
31479 is a composite number with 8 divisors. Its prime factorisation is 3 × 7 × 1499. Divisors (8): 1, 3, 7, 21, 1499, 4497, 10493, 31479.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31479 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31479 is composite. Its prime factorisation is
- 3
The divisors add up to 48000; without 31479 itself that is 16521, so 31479 is deficient (16521 is less than 31479). Euler's totient φ(31479) = 17976 numbers up to 31479 share no factor with it.
- 4
The digits of 31479 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 54 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31479 = 3 \times 7 \times 1499 \]
31479 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 48000 |
| Euler totient φ(n) | 17976 |
| Square | 990927441 |
| Cube | 31193404915239 |
| Square root | 177.423223 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 54 |
| Scientific notation | 3.1479 × |
31479 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and seventy-nine |
| Binary (base 2) | 111101011110111 |
| Octal (base 8) | 75367 |
| Hexadecimal (base 16) | 7AF7 |
| Base 3 | 1121011220 |
| As time | 31479 seconds = 8 h 44 min 39 s |
Is 31479 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 | Yes (31479 ÷ 3 = 10493) | 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 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (31479 ÷ 7 = 4497) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31479 a prime number?
No. 31479 = 3 × 7 × 1499, so it is divisible by 3.
What are the factors of 31479?
1, 3, 7, 21, 1499, 4497, 10493, 31479.
What is 31479 in binary?
111101011110111 (hexadecimal 7AF7, octal 75367).
What is the square root of 31479?
About 177.4232.
Is 31479 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 31479?
It is a composite number with 8 divisors.