The number 55831
55831 is a composite number with 4 divisors. Its prime factorisation is 31 × 1801. Divisors (4): 1, 31, 1801, 55831.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55831: a semiprime: 31 × 1801, the product of two primes.
- 2
55831 is composite. Its prime factorisation is
- 3
The divisors add up to 57664; without 55831 itself that is 1833, so 55831 is deficient (1833 is less than 55831). Euler's totient φ(55831) = 54000 numbers up to 55831 share no factor with it.
- 4
The digits of 55831 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 91 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55831 = 31 \times 1801 \]
55831 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 57664 |
| Euler totient φ(n) | 54000 |
| Square | 3117100561 |
| Cube | 174030841421191 |
| Square root | 236.285844 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 91 |
| Scientific notation | 5.5831 × |
55831 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand eight hundred and thirty-one |
| Binary (base 2) | 1101101000010111 |
| Octal (base 8) | 155027 |
| Hexadecimal (base 16) | DA17 |
| Base 3 | 2211120211 |
| As time | 55831 seconds = 15 h 30 min 31 s |
Is 55831 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 6) | 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 4) | 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 | No (remainder 6) | 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 55831 a prime number?
No. 55831 = 31 × 1801, so it is divisible by 31.
What are the factors of 55831?
1, 31, 1801, 55831.
What is 55831 in binary?
1101101000010111 (hexadecimal DA17, octal 155027).
What is the square root of 55831?
About 236.2858.
Is 55831 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 55831?
55831 is a semiprime: 31 × 1801, the product of two primes.