The number 80321
80321 is a composite number with 4 divisors. Its prime factorisation is 31 × 2591. Divisors (4): 1, 31, 2591, 80321.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80321: a semiprime: 31 × 2591, the product of two primes.
- 2
80321 is composite. Its prime factorisation is
- 3
The divisors add up to 82944; without 80321 itself that is 2623, so 80321 is deficient (2623 is less than 80321). Euler's totient φ(80321) = 77700 numbers up to 80321 share no factor with it.
- 4
The digits of 80321 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 68 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80321 = 31 \times 2591 \]
80321 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 82944 |
| Euler totient φ(n) | 77700 |
| Square | 6451463041 |
| Cube | 518187962916161 |
| Square root | 283.409598 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 68 |
| Scientific notation | 8.0321 × |
80321 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand three hundred and twenty-one |
| Binary (base 2) | 10011100111000001 |
| Octal (base 8) | 234701 |
| Hexadecimal (base 16) | 139C1 |
| Base 3 | 11002011212 |
| As time | 80321 seconds = 22 h 18 min 41 s |
Is 80321 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 3) | 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 5) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80321 a prime number?
No. 80321 = 31 × 2591, so it is divisible by 31.
What are the factors of 80321?
1, 31, 2591, 80321.
What is 80321 in binary?
10011100111000001 (hexadecimal 139C1, octal 234701).
What is the square root of 80321?
About 283.4096.
Is 80321 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 80321?
80321 is a semiprime: 31 × 2591, the product of two primes.