The number 31443
31443 is a composite number with 8 divisors. Its prime factorisation is 3 × 47 × 223. Divisors (8): 1, 3, 47, 141, 223, 669, 10481, 31443.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31443 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31443 is composite. Its prime factorisation is
- 3
The divisors add up to 43008; without 31443 itself that is 11565, so 31443 is deficient (11565 is less than 31443). Euler's totient φ(31443) = 20424 numbers up to 31443 share no factor with it.
- 4
The digits of 31443 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31443 = 3 \times 47 \times 223 \]
31443 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 43008 |
| Euler totient φ(n) | 20424 |
| Square | 988662249 |
| Cube | 31086507095307 |
| Square root | 177.321741 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1443 × |
31443 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and forty-three |
| Binary (base 2) | 111101011010011 |
| Octal (base 8) | 75323 |
| Hexadecimal (base 16) | 7AD3 |
| Base 3 | 1121010120 |
| As time | 31443 seconds = 8 h 44 min 3 s |
Is 31443 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 (31443 ÷ 3 = 10481) | 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 3) | 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 | No (remainder 6) | 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 3) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 31443 a prime number?
No. 31443 = 3 × 47 × 223, so it is divisible by 3.
What are the factors of 31443?
1, 3, 47, 141, 223, 669, 10481, 31443.
What is 31443 in binary?
111101011010011 (hexadecimal 7AD3, octal 75323).
What is the square root of 31443?
About 177.3217.
Is 31443 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 31443?
It is a composite number with 8 divisors.