The number 41721
41721 is a composite number with 4 divisors. Its prime factorisation is 3 × 13907. Divisors (4): 1, 3, 13907, 41721.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 41721: a semiprime: 3 × 13907, the product of two primes.
- 2
41721 is composite. Its prime factorisation is
- 3
The divisors add up to 55632; without 41721 itself that is 13911, so 41721 is deficient (13911 is less than 41721). Euler's totient φ(41721) = 27812 numbers up to 41721 share no factor with it.
- 4
The digits of 41721 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 88 steps to reach 1.
LaTeX source of the formulas on this page
\[ 41721 = 3 \times 13907 \]
41721 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 55632 |
| Euler totient φ(n) | 27812 |
| Square | 1740641841 |
| Cube | 72621318248361 |
| Square root | 204.257191 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 88 |
| Scientific notation | 4.1721 × |
41721 in other forms
| Form | Value |
|---|---|
| In words | forty-one thousand seven hundred and twenty-one |
| Binary (base 2) | 1010001011111001 |
| Octal (base 8) | 121371 |
| Hexadecimal (base 16) | A2F9 |
| Base 3 | 2010020020 |
| As time | 41721 seconds = 11 h 35 min 21 s |
Is 41721 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 | Yes (41721 ÷ 3 = 13907) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 6) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 41721 a prime number?
No. 41721 = 3 × 13907, so it is divisible by 3.
What are the factors of 41721?
1, 3, 13907, 41721.
What is 41721 in binary?
1010001011111001 (hexadecimal A2F9, octal 121371).
What is the square root of 41721?
About 204.2572.
Is 41721 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 41721?
41721 is a semiprime: 3 × 13907, the product of two primes.