The number 42691
42691 is a composite number with 4 divisors. Its prime factorisation is 11 × 3881. Divisors (4): 1, 11, 3881, 42691.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42691: a semiprime: 11 × 3881, the product of two primes.
- 2
42691 is composite. Its prime factorisation is
- 3
The divisors add up to 46584; without 42691 itself that is 3893, so 42691 is deficient (3893 is less than 42691). Euler's totient φ(42691) = 38800 numbers up to 42691 share no factor with it.
- 4
The digits of 42691 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 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42691 = 11 \times 3881 \]
42691 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46584 |
| Euler totient φ(n) | 38800 |
| Square | 1822521481 |
| Cube | 77805264545371 |
| Square root | 206.618005 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.2691 × |
42691 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand six hundred and ninety-one |
| Binary (base 2) | 1010011011000011 |
| Octal (base 8) | 123303 |
| Hexadecimal (base 16) | A6C3 |
| Base 3 | 2011120011 |
| As time | 42691 seconds = 11 h 51 min 31 s |
Is 42691 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 1) | 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 1) | 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 4) | 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 | Yes (42691 ÷ 11 = 3881) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42691 a prime number?
No. 42691 = 11 × 3881, so it is divisible by 11.
What are the factors of 42691?
1, 11, 3881, 42691.
What is 42691 in binary?
1010011011000011 (hexadecimal A6C3, octal 123303).
What is the square root of 42691?
About 206.6180.
Is 42691 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 42691?
42691 is a semiprime: 11 × 3881, the product of two primes.