The number 55018
55018 is a composite number with 4 divisors. Its prime factorisation is 2 × 27509. Divisors (4): 1, 2, 27509, 55018.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55018: a semiprime: 2 × 27509, the product of two primes.
- 2
55018 is composite. Its prime factorisation is
- 3
The divisors add up to 82530; without 55018 itself that is 27512, so 55018 is deficient (27512 is less than 55018). Euler's totient φ(55018) = 27508 numbers up to 55018 share no factor with it.
- 4
The digits of 55018 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 153 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55018 = 2 \times 27509 \]
55018 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 82530 |
| Euler totient φ(n) | 27508 |
| Square | 3026980324 |
| Cube | 166538403465832 |
| Square root | 234.559161 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 153 |
| Scientific notation | 5.5018 × |
55018 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand and eighteen |
| Binary (base 2) | 1101011011101010 |
| Octal (base 8) | 153352 |
| Hexadecimal (base 16) | D6EA |
| Base 3 | 2210110201 |
| As time | 55018 seconds = 15 h 16 min 58 s |
Is 55018 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (55018 ÷ 2 = 27509) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55018 a prime number?
No. 55018 = 2 × 27509, so it is divisible by 2.
What are the factors of 55018?
1, 2, 27509, 55018.
What is 55018 in binary?
1101011011101010 (hexadecimal D6EA, octal 153352).
What is the square root of 55018?
About 234.5592.
Is 55018 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 55018?
55018 is a semiprime: 2 × 27509, the product of two primes.