The number 42161
42161 is a composite number with 8 divisors. Its prime factorisation is 7 × 19 × 317. Divisors (8): 1, 7, 19, 133, 317, 2219, 6023, 42161.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42161 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42161 is composite. Its prime factorisation is
- 3
The divisors add up to 50880; without 42161 itself that is 8719, so 42161 is deficient (8719 is less than 42161). Euler's totient φ(42161) = 34128 numbers up to 42161 share no factor with it.
- 4
The digits of 42161 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 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42161 = 7 \times 19 \times 317 \]
42161 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 50880 |
| Euler totient φ(n) | 34128 |
| Square | 1777549921 |
| Cube | 74943282219281 |
| Square root | 205.331439 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2161 × |
42161 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand one hundred and sixty-one |
| Binary (base 2) | 1010010010110001 |
| Octal (base 8) | 122261 |
| Hexadecimal (base 16) | A4B1 |
| Base 3 | 2010211112 |
| As time | 42161 seconds = 11 h 42 min 41 s |
Is 42161 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 1) | 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 | Yes (42161 ÷ 7 = 6023) | 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 1) | 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 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42161 a prime number?
No. 42161 = 7 × 19 × 317, so it is divisible by 7.
What are the factors of 42161?
1, 7, 19, 133, 317, 2219, 6023, 42161.
What is 42161 in binary?
1010010010110001 (hexadecimal A4B1, octal 122261).
What is the square root of 42161?
About 205.3314.
Is 42161 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 42161?
It is a composite number with 8 divisors.