The number 61329
61329 is a composite number with 4 divisors. Its prime factorisation is 3 × 20443. Divisors (4): 1, 3, 20443, 61329.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 61329: a semiprime: 3 × 20443, the product of two primes.
- 2
61329 is composite. Its prime factorisation is
- 3
The divisors add up to 81776; without 61329 itself that is 20447, so 61329 is deficient (20447 is less than 61329). Euler's totient φ(61329) = 40884 numbers up to 61329 share no factor with it.
- 4
The digits of 61329 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 148 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61329 = 3 \times 20443 \]
61329 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 81776 |
| Euler totient φ(n) | 40884 |
| Square | 3761246241 |
| Cube | 230673470714289 |
| Square root | 247.646926 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 148 |
| Scientific notation | 6.1329 × |
61329 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand three hundred and twenty-nine |
| Binary (base 2) | 1110111110010001 |
| Octal (base 8) | 167621 |
| Hexadecimal (base 16) | EF91 |
| Base 3 | 10010010110 |
| As time | 61329 seconds = 17 h 2 min 9 s |
Is 61329 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 (61329 ÷ 3 = 20443) | 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 4) | 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 2) | 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 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | 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 61329 a prime number?
No. 61329 = 3 × 20443, so it is divisible by 3.
What are the factors of 61329?
1, 3, 20443, 61329.
What is 61329 in binary?
1110111110010001 (hexadecimal EF91, octal 167621).
What is the square root of 61329?
About 247.6469.
Is 61329 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 61329?
61329 is a semiprime: 3 × 20443, the product of two primes.