The number 42091
42091 is a composite number with 6 divisors. Its prime factorisation is Ć 859. Divisors (6): 1, 7, 49, 859, 6013, 42091.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42091 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42091 is composite. Its prime factorisation is
- 3
The divisors add up to 49020; without 42091 itself that is 6929, so 42091 is deficient (6929 is less than 42091). Euler's totient Ļ(42091) = 36036 numbers up to 42091 share no factor with it.
- 4
The digits of 42091 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 181 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42091 = 7^{2} \times 859 \]42091 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 49020 |
| Euler totient Ļ(n) | 36036 |
| Square | 1771652281 |
| Cube | 74570616159571 |
| Square root | 205.160912 (= 7ā859) |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 181 |
| Scientific notation | 4.2091 Ć |
42091 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand and ninety-one |
| Binary (base 2) | 1010010001101011 |
| Octal (base 8) | 122153 |
| Hexadecimal (base 16) | A46B |
| Base 3 | 2010201221 |
| As time | 42091 seconds = 11 h 41 min 31 s |
Is 42091 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 | Yes (42091 Ć· 7 = 6013) | 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 7) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42091 a prime number?
No. 42091 = Ć 859, so it is divisible by 7.
What are the factors of 42091?
1, 7, 49, 859, 6013, 42091.
What is 42091 in binary?
1010010001101011 (hexadecimal A46B, octal 122153).
What is the square root of 42091?
About 205.1609, exactly 7ā859.
Is 42091 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 42091?
It is a composite number with 6 divisors.