The number 55231
55231 is a composite number with 4 divisors. Its prime factorisation is 11 × 5021. Divisors (4): 1, 11, 5021, 55231.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55231: a semiprime: 11 × 5021, the product of two primes.
- 2
55231 is composite. Its prime factorisation is
- 3
The divisors add up to 60264; without 55231 itself that is 5033, so 55231 is deficient (5033 is less than 55231). Euler's totient φ(55231) = 50200 numbers up to 55231 share no factor with it.
- 4
The digits of 55231 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 166 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55231 = 11 \times 5021 \]
55231 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 60264 |
| Euler totient φ(n) | 50200 |
| Square | 3050463361 |
| Cube | 168480141891391 |
| Square root | 235.012766 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 166 |
| Scientific notation | 5.5231 × |
55231 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand two hundred and thirty-one |
| Binary (base 2) | 1101011110111111 |
| Octal (base 8) | 153677 |
| Hexadecimal (base 16) | D7BF |
| Base 3 | 2210202121 |
| As time | 55231 seconds = 15 h 20 min 31 s |
Is 55231 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 1) | 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (55231 ÷ 11 = 5021) | 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 55231 a prime number?
No. 55231 = 11 × 5021, so it is divisible by 11.
What are the factors of 55231?
1, 11, 5021, 55231.
What is 55231 in binary?
1101011110111111 (hexadecimal D7BF, octal 153677).
What is the square root of 55231?
About 235.0128.
Is 55231 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 55231?
55231 is a semiprime: 11 × 5021, the product of two primes.