The number 42971
42971 is a composite number with 4 divisors. Its prime factorisation is 97 × 443. Divisors (4): 1, 97, 443, 42971.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42971: a semiprime: 97 × 443, the product of two primes.
- 2
42971 is composite. Its prime factorisation is
- 3
The divisors add up to 43512; without 42971 itself that is 541, so 42971 is deficient (541 is less than 42971). Euler's totient φ(42971) = 42432 numbers up to 42971 share no factor with it.
- 4
The digits of 42971 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42971 = 97 \times 443 \]
42971 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43512 |
| Euler totient φ(n) | 42432 |
| Square | 1846506841 |
| Cube | 79346245464611 |
| Square root | 207.294477 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2971 × |
42971 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and seventy-one |
| Binary (base 2) | 1010011111011011 |
| Octal (base 8) | 123733 |
| Hexadecimal (base 16) | A7DB |
| Base 3 | 2011221112 |
| As time | 42971 seconds = 11 h 56 min 11 s |
Is 42971 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 5) | 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 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 5) | 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 42971 a prime number?
No. 42971 = 97 × 443, so it is divisible by 97.
What are the factors of 42971?
1, 97, 443, 42971.
What is 42971 in binary?
1010011111011011 (hexadecimal A7DB, octal 123733).
What is the square root of 42971?
About 207.2945.
Is 42971 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 42971?
42971 is a semiprime: 97 × 443, the product of two primes.