The number 80081
80081 is a composite number with 4 divisors. Its prime factorisation is 73 × 1097. Divisors (4): 1, 73, 1097, 80081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80081: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 73 × 1097, the product of two primes.
- 2
80081 is composite. Its prime factorisation is
- 3
The divisors add up to 81252; without 80081 itself that is 1171, so 80081 is deficient (1171 is less than 80081). Euler's totient φ(80081) = 78912 numbers up to 80081 share no factor with it.
- 4
The digits of 80081 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 107 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80081 = 73 \times 1097 \]
80081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 81252 |
| Euler totient φ(n) | 78912 |
| Square | 6412966561 |
| Cube | 513556775171441 |
| Square root | 282.985865 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 107 |
| Scientific notation | 8.0081 × |
80081 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand and eighty-one |
| Binary (base 2) | 10011100011010001 |
| Octal (base 8) | 234321 |
| Hexadecimal (base 16) | 138D1 |
| Base 3 | 11001211222 |
| As time | 80081 seconds = 22 h 14 min 41 s |
Is 80081 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 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80081 a prime number?
No. 80081 = 73 × 1097, so it is divisible by 73.
What are the factors of 80081?
1, 73, 1097, 80081.
What is 80081 in binary?
10011100011010001 (hexadecimal 138D1, octal 234321).
What is the square root of 80081?
About 282.9859.
Is 80081 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 80081?
80081 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 73 × 1097, the product of two primes.