The number 55421
55421 is a composite number with 4 divisors. Its prime factorisation is 157 × 353. Divisors (4): 1, 157, 353, 55421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55421: a semiprime: 157 × 353, the product of two primes.
- 2
55421 is composite. Its prime factorisation is
- 3
The divisors add up to 55932; without 55421 itself that is 511, so 55421 is deficient (511 is less than 55421). Euler's totient φ(55421) = 54912 numbers up to 55421 share no factor with it.
- 4
The digits of 55421 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 91 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55421 = 157 \times 353 \]
55421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 55932 |
| Euler totient φ(n) | 54912 |
| Square | 3071487241 |
| Cube | 170224894383461 |
| Square root | 235.416652 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 91 |
| Scientific notation | 5.5421 × |
55421 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand four hundred and twenty-one |
| Binary (base 2) | 1101100001111101 |
| Octal (base 8) | 154175 |
| Hexadecimal (base 16) | D87D |
| Base 3 | 2211000122 |
| As time | 55421 seconds = 15 h 23 min 41 s |
Is 55421 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 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | 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 5) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55421 a prime number?
No. 55421 = 157 × 353, so it is divisible by 157.
What are the factors of 55421?
1, 157, 353, 55421.
What is 55421 in binary?
1101100001111101 (hexadecimal D87D, octal 154175).
What is the square root of 55421?
About 235.4167.
Is 55421 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 55421?
55421 is a semiprime: 157 × 353, the product of two primes.