The number 49781
49781 is a composite number with 4 divisors. Its prime factorisation is 67 × 743. Divisors (4): 1, 67, 743, 49781.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 49781: a semiprime: 67 × 743, the product of two primes.
- 2
49781 is composite. Its prime factorisation is
- 3
The divisors add up to 50592; without 49781 itself that is 811, so 49781 is deficient (811 is less than 49781). Euler's totient φ(49781) = 48972 numbers up to 49781 share no factor with it.
- 4
The digits of 49781 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 39 steps to reach 1.
LaTeX source of the formulas on this page
\[ 49781 = 67 \times 743 \]
49781 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 50592 |
| Euler totient φ(n) | 48972 |
| Square | 2478147961 |
| Cube | 123364683646541 |
| Square root | 223.116561 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 39 |
| Scientific notation | 4.9781 × |
49781 in other forms
| Form | Value |
|---|---|
| In words | forty-nine thousand seven hundred and eighty-one |
| Binary (base 2) | 1100001001110101 |
| Octal (base 8) | 141165 |
| Hexadecimal (base 16) | C275 |
| Base 3 | 2112021202 |
| As time | 49781 seconds = 13 h 49 min 41 s |
Is 49781 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 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 49781 a prime number?
No. 49781 = 67 × 743, so it is divisible by 67.
What are the factors of 49781?
1, 67, 743, 49781.
What is 49781 in binary?
1100001001110101 (hexadecimal C275, octal 141165).
What is the square root of 49781?
About 223.1166.
Is 49781 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 49781?
49781 is a semiprime: 67 × 743, the product of two primes.