The number 55855
55855 is a palindrome: it reads 55855 backwards too. Its prime factorisation is 5 × 11171. Divisors (4): 1, 5, 11171, 55855.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55855: a palindrome: it reads 55855 backwards too; a semiprime: 5 × 11171, the product of two primes.
- 2
55855 is composite. Its prime factorisation is
- 3
The divisors add up to 67032; without 55855 itself that is 11177, so 55855 is deficient (11177 is less than 55855). Euler's totient φ(55855) = 44680 numbers up to 55855 share no factor with it.
- 4
The digits of 55855 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 184 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55855 = 5 \times 11171 \]
55855 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 67032 |
| Euler totient φ(n) | 44680 |
| Square | 3119781025 |
| Cube | 174255369151375 |
| Square root | 236.336624 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 184 |
| Scientific notation | 5.5855 × |
55855 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand eight hundred and fifty-five |
| Binary (base 2) | 1101101000101111 |
| Octal (base 8) | 155057 |
| Hexadecimal (base 16) | DA2F |
| Base 3 | 2211121201 |
| As time | 55855 seconds = 15 h 30 min 55 s |
Is 55855 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 (55855 ÷ 5 = 11171) | 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 7) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | 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 55855 a prime number?
No. 55855 = 5 × 11171, so it is divisible by 5.
What are the factors of 55855?
1, 5, 11171, 55855.
What is 55855 in binary?
1101101000101111 (hexadecimal DA2F, octal 155057).
What is the square root of 55855?
About 236.3366.
Is 55855 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 55855?
55855 is a palindrome: it reads 55855 backwards too; a semiprime: 5 × 11171, the product of two primes.