The number 55771
55771 is a composite number with 4 divisors. Its prime factorisation is 43 × 1297. Divisors (4): 1, 43, 1297, 55771.
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How to work it out
- 1
What is special about 55771: a semiprime: 43 × 1297, the product of two primes.
- 2
55771 is composite. Its prime factorisation is
- 3
The divisors add up to 57112; without 55771 itself that is 1341, so 55771 is deficient (1341 is less than 55771). Euler's totient φ(55771) = 54432 numbers up to 55771 share no factor with it.
- 4
The digits of 55771 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55771 = 43 \times 1297 \]
55771 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 57112 |
| Euler totient φ(n) | 54432 |
| Square | 3110404441 |
| Cube | 173470366079011 |
| Square root | 236.158845 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 60 |
| Scientific notation | 5.5771 × |
55771 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand seven hundred and seventy-one |
| Binary (base 2) | 1101100111011011 |
| Octal (base 8) | 154733 |
| Hexadecimal (base 16) | D9DB |
| Base 3 | 2211111121 |
| As time | 55771 seconds = 15 h 29 min 31 s |
Is 55771 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 | 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 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 1) | 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 55771 a prime number?
No. 55771 = 43 × 1297, so it is divisible by 43.
What are the factors of 55771?
1, 43, 1297, 55771.
What is 55771 in binary?
1101100111011011 (hexadecimal D9DB, octal 154733).
What is the square root of 55771?
About 236.1588.
Is 55771 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 55771?
55771 is a semiprime: 43 × 1297, the product of two primes.