The number 55985
55985 is a composite number with 4 divisors. Its prime factorisation is 5 × 11197. Divisors (4): 1, 5, 11197, 55985.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55985: a semiprime: 5 × 11197, the product of two primes.
- 2
55985 is composite. Its prime factorisation is
- 3
The divisors add up to 67188; without 55985 itself that is 11203, so 55985 is deficient (11203 is less than 55985). Euler's totient φ(55985) = 44784 numbers up to 55985 share no factor with it.
- 4
The digits of 55985 add up to 32, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 153 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55985 = 5 \times 11197 \]
55985 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 67188 |
| Euler totient φ(n) | 44784 |
| Square | 3134320225 |
| Cube | 175474917796625 |
| Square root | 236.611496 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 153 |
| Scientific notation | 5.5985 × |
55985 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand nine hundred and eighty-five |
| Binary (base 2) | 1101101010110001 |
| Octal (base 8) | 155261 |
| Hexadecimal (base 16) | DAB1 |
| Base 3 | 2211210112 |
| As time | 55985 seconds = 15 h 33 min 5 s |
Is 55985 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 | Yes (55985 ÷ 5 = 11197) | 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 6) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | 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 55985 a prime number?
No. 55985 = 5 × 11197, so it is divisible by 5.
What are the factors of 55985?
1, 5, 11197, 55985.
What is 55985 in binary?
1101101010110001 (hexadecimal DAB1, octal 155261).
What is the square root of 55985?
About 236.6115.
Is 55985 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 55985?
55985 is a semiprime: 5 × 11197, the product of two primes.