The number 77771
77771 is a composite number with 4 divisors. Its prime factorisation is 83 × 937. Divisors (4): 1, 83, 937, 77771.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77771: a semiprime: 83 × 937, the product of two primes.
- 2
77771 is composite. Its prime factorisation is
- 3
The divisors add up to 78792; without 77771 itself that is 1021, so 77771 is deficient (1021 is less than 77771). Euler's totient φ(77771) = 76752 numbers up to 77771 share no factor with it.
- 4
The digits of 77771 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 50 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77771 = 83 \times 937 \]
77771 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 78792 |
| Euler totient φ(n) | 76752 |
| Square | 6048328441 |
| Cube | 470384551185011 |
| Square root | 278.874524 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 50 |
| Scientific notation | 7.7771 × |
77771 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand seven hundred and seventy-one |
| Binary (base 2) | 10010111111001011 |
| Octal (base 8) | 227713 |
| Hexadecimal (base 16) | 12FCB |
| Base 3 | 10221200102 |
| As time | 77771 seconds = 21 h 36 min 11 s |
Is 77771 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 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 77771 a prime number?
No. 77771 = 83 × 937, so it is divisible by 83.
What are the factors of 77771?
1, 83, 937, 77771.
What is 77771 in binary?
10010111111001011 (hexadecimal 12FCB, octal 227713).
What is the square root of 77771?
About 278.8745.
Is 77771 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 77771?
77771 is a semiprime: 83 × 937, the product of two primes.