The number 55555
55555 is a palindrome: it reads 55555 backwards too. Its prime factorisation is 5 × 41 × 271. Divisors (8): 1, 5, 41, 205, 271, 1355, 11111, 55555.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55555: a palindrome: it reads 55555 backwards too.
- 2
55555 is composite. Its prime factorisation is
- 3
The divisors add up to 68544; without 55555 itself that is 12989, so 55555 is deficient (12989 is less than 55555). Euler's totient φ(55555) = 43200 numbers up to 55555 share no factor with it.
- 4
The digits of 55555 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 153 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55555 = 5 \times 41 \times 271 \]
55555 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 68544 |
| Euler totient φ(n) | 43200 |
| Square | 3086358025 |
| Cube | 171462620078875 |
| Square root | 235.701082 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 153 |
| Scientific notation | 5.5555 × |
55555 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand five hundred and fifty-five |
| Binary (base 2) | 1101100100000011 |
| Octal (base 8) | 154403 |
| Hexadecimal (base 16) | D903 |
| Base 3 | 2211012121 |
| As time | 55555 seconds = 15 h 25 min 55 s |
Is 55555 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 | Yes (55555 ÷ 5 = 11111) | 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 3) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 55555 a prime number?
No. 55555 = 5 × 41 × 271, so it is divisible by 5.
What are the factors of 55555?
1, 5, 41, 205, 271, 1355, 11111, 55555.
What is 55555 in binary?
1101100100000011 (hexadecimal D903, octal 154403).
What is the square root of 55555?
About 235.7011.
Is 55555 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 55555?
55555 is a palindrome: it reads 55555 backwards too.