The number 55087
55087 is a composite number with 4 divisors. Its prime factorisation is 31 × 1777. Divisors (4): 1, 31, 1777, 55087.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55087: a semiprime: 31 × 1777, the product of two primes.
- 2
55087 is composite. Its prime factorisation is
- 3
The divisors add up to 56896; without 55087 itself that is 1809, so 55087 is deficient (1809 is less than 55087). Euler's totient φ(55087) = 53280 numbers up to 55087 share no factor with it.
- 4
The digits of 55087 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 184 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55087 = 31 \times 1777 \]
55087 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56896 |
| Euler totient φ(n) | 53280 |
| Square | 3034577569 |
| Cube | 167165774543503 |
| Square root | 234.706199 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 184 |
| Scientific notation | 5.5087 × |
55087 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand and eighty-seven |
| Binary (base 2) | 1101011100101111 |
| Octal (base 8) | 153457 |
| Hexadecimal (base 16) | D72F |
| Base 3 | 2210120021 |
| As time | 55087 seconds = 15 h 18 min 7 s |
Is 55087 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 2) | 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 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 7) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 55087 a prime number?
No. 55087 = 31 × 1777, so it is divisible by 31.
What are the factors of 55087?
1, 31, 1777, 55087.
What is 55087 in binary?
1101011100101111 (hexadecimal D72F, octal 153457).
What is the square root of 55087?
About 234.7062.
Is 55087 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 55087?
55087 is a semiprime: 31 × 1777, the product of two primes.