The number 55123
55123 is a composite number with 4 divisors. Its prime factorisation is 199 × 277. Divisors (4): 1, 199, 277, 55123.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55123: a semiprime: 199 × 277, the product of two primes.
- 2
55123 is composite. Its prime factorisation is
- 3
The divisors add up to 55600; without 55123 itself that is 477, so 55123 is deficient (477 is less than 55123). Euler's totient φ(55123) = 54648 numbers up to 55123 share no factor with it.
- 4
The digits of 55123 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 140 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55123 = 199 \times 277 \]
55123 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 55600 |
| Euler totient φ(n) | 54648 |
| Square | 3038545129 |
| Cube | 167493723145867 |
| Square root | 234.782878 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 140 |
| Scientific notation | 5.5123 × |
55123 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand one hundred and twenty-three |
| Binary (base 2) | 1101011101010011 |
| Octal (base 8) | 153523 |
| Hexadecimal (base 16) | D753 |
| Base 3 | 2210121121 |
| As time | 55123 seconds = 15 h 18 min 43 s |
Is 55123 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 3) | 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 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 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | 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 55123 a prime number?
No. 55123 = 199 × 277, so it is divisible by 199.
What are the factors of 55123?
1, 199, 277, 55123.
What is 55123 in binary?
1101011101010011 (hexadecimal D753, octal 153523).
What is the square root of 55123?
About 234.7829.
Is 55123 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 55123?
55123 is a semiprime: 199 × 277, the product of two primes.