The number 71231
71231 is a composite number with 8 divisors. Its prime factorisation is 19 × 23 × 163. Divisors (8): 1, 19, 23, 163, 437, 3097, 3749, 71231.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
71231 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71231 is composite. Its prime factorisation is
- 3
The divisors add up to 78720; without 71231 itself that is 7489, so 71231 is deficient (7489 is less than 71231). Euler's totient φ(71231) = 64152 numbers up to 71231 share no factor with it.
- 4
The digits of 71231 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 218 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71231 = 19 \times 23 \times 163 \]
71231 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 78720 |
| Euler totient φ(n) | 64152 |
| Square | 5073855361 |
| Cube | 361415791219391 |
| Square root | 266.891364 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 218 |
| Scientific notation | 7.1231 × |
71231 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand two hundred and thirty-one |
| Binary (base 2) | 10001011000111111 |
| Octal (base 8) | 213077 |
| Hexadecimal (base 16) | 1163F |
| Base 3 | 10121201012 |
| As time | 71231 seconds = 19 h 47 min 11 s |
Is 71231 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 | No (remainder 2) | 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 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 71231 a prime number?
No. 71231 = 19 × 23 × 163, so it is divisible by 19.
What are the factors of 71231?
1, 19, 23, 163, 437, 3097, 3749, 71231.
What is 71231 in binary?
10001011000111111 (hexadecimal 1163F, octal 213077).
What is the square root of 71231?
About 266.8914.
Is 71231 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 71231?
It is a composite number with 8 divisors.