The number 55409
55409 is a composite number with 4 divisors. Its prime factorisation is 67 × 827. Divisors (4): 1, 67, 827, 55409.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55409: a semiprime: 67 × 827, the product of two primes.
- 2
55409 is composite. Its prime factorisation is
- 3
The divisors add up to 56304; without 55409 itself that is 895, so 55409 is deficient (895 is less than 55409). Euler's totient φ(55409) = 54516 numbers up to 55409 share no factor with it.
- 4
The digits of 55409 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 153 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55409 = 67 \times 827 \]
55409 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56304 |
| Euler totient φ(n) | 54516 |
| Square | 3070157281 |
| Cube | 170114344782929 |
| Square root | 235.391164 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 153 |
| Scientific notation | 5.5409 × |
55409 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand four hundred and nine |
| Binary (base 2) | 1101100001110001 |
| Octal (base 8) | 154161 |
| Hexadecimal (base 16) | D871 |
| Base 3 | 2211000012 |
| As time | 55409 seconds = 15 h 23 min 29 s |
Is 55409 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 4) | 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 4) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55409 a prime number?
No. 55409 = 67 × 827, so it is divisible by 67.
What are the factors of 55409?
1, 67, 827, 55409.
What is 55409 in binary?
1101100001110001 (hexadecimal D871, octal 154161).
What is the square root of 55409?
About 235.3912.
Is 55409 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 55409?
55409 is a semiprime: 67 × 827, the product of two primes.