The number 81073
81073 is a composite number with 8 divisors. Its prime factorisation is 17 × 19 × 251. Divisors (8): 1, 17, 19, 251, 323, 4267, 4769, 81073.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 81073: a Harshad number: divisible by its digit sum 19.
- 2
81073 is composite. Its prime factorisation is
- 3
The divisors add up to 90720; without 81073 itself that is 9647, so 81073 is deficient (9647 is less than 81073). Euler's totient φ(81073) = 72000 numbers up to 81073 share no factor with it.
- 4
The digits of 81073 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81073 = 17 \times 19 \times 251 \]
81073 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 90720 |
| Euler totient φ(n) | 72000 |
| Square | 6572831329 |
| Cube | 532879154336017 |
| Square root | 284.733208 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 89 |
| Scientific notation | 8.1073 × |
81073 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand and seventy-three |
| Binary (base 2) | 10011110010110001 |
| Octal (base 8) | 236261 |
| Hexadecimal (base 16) | 13CB1 |
| Base 3 | 11010012201 |
| As time | 81073 seconds = 22 h 31 min 13 s |
Is 81073 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 3) | 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 | No (remainder 6) | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 3) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 81073 a prime number?
No. 81073 = 17 × 19 × 251, so it is divisible by 17.
What are the factors of 81073?
1, 17, 19, 251, 323, 4267, 4769, 81073.
What is 81073 in binary?
10011110010110001 (hexadecimal 13CB1, octal 236261).
What is the square root of 81073?
About 284.7332.
Is 81073 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 81073?
81073 is a Harshad number: divisible by its digit sum 19.