The number 42011
42011 is a composite number with 4 divisors. Its prime factorisation is 43 × 977. Divisors (4): 1, 43, 977, 42011.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42011: a semiprime: 43 × 977, the product of two primes.
- 2
42011 is composite. Its prime factorisation is
- 3
The divisors add up to 43032; without 42011 itself that is 1021, so 42011 is deficient (1021 is less than 42011). Euler's totient φ(42011) = 40992 numbers up to 42011 share no factor with it.
- 4
The digits of 42011 add up to 8, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 181 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42011 = 43 \times 977 \]
42011 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43032 |
| Euler totient φ(n) | 40992 |
| Square | 1764924121 |
| Cube | 74146227247331 |
| Square root | 204.965851 |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 181 |
| Scientific notation | 4.2011 × |
42011 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand and eleven |
| Binary (base 2) | 1010010000011011 |
| Octal (base 8) | 122033 |
| Hexadecimal (base 16) | A41B |
| Base 3 | 2010121222 |
| As time | 42011 seconds = 11 h 40 min 11 s |
Is 42011 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 4) | 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 8) | 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 2) | 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 42011 a prime number?
No. 42011 = 43 × 977, so it is divisible by 43.
What are the factors of 42011?
1, 43, 977, 42011.
What is 42011 in binary?
1010010000011011 (hexadecimal A41B, octal 122033).
What is the square root of 42011?
About 204.9659.
Is 42011 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 42011?
42011 is a semiprime: 43 × 977, the product of two primes.