The number 80101
80101 is a composite number with 4 divisors. Its prime factorisation is 7 × 11443. Divisors (4): 1, 7, 11443, 80101.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80101: a semiprime: 7 × 11443, the product of two primes.
- 2
80101 is composite. Its prime factorisation is
- 3
The divisors add up to 91552; without 80101 itself that is 11451, so 80101 is deficient (11451 is less than 80101). Euler's totient φ(80101) = 68652 numbers up to 80101 share no factor with it.
- 4
The digits of 80101 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80101 = 7 \times 11443 \]
80101 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 91552 |
| Euler totient φ(n) | 68652 |
| Square | 6416170201 |
| Cube | 513941649270301 |
| Square root | 283.021201 |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 138 |
| Scientific notation | 8.0101 × |
80101 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand one hundred and one |
| Binary (base 2) | 10011100011100101 |
| Octal (base 8) | 234345 |
| Hexadecimal (base 16) | 138E5 |
| Base 3 | 11001212201 |
| As time | 80101 seconds = 22 h 15 min 1 s |
Is 80101 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 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (80101 ÷ 7 = 11443) | 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 1) | 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 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80101 a prime number?
No. 80101 = 7 × 11443, so it is divisible by 7.
What are the factors of 80101?
1, 7, 11443, 80101.
What is 80101 in binary?
10011100011100101 (hexadecimal 138E5, octal 234345).
What is the square root of 80101?
About 283.0212.
Is 80101 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 80101?
80101 is a semiprime: 7 × 11443, the product of two primes.