The number 80813
80813 is a composite number with 4 divisors. Its prime factorisation is 211 × 383. Divisors (4): 1, 211, 383, 80813.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80813: a semiprime: 211 × 383, the product of two primes.
- 2
80813 is composite. Its prime factorisation is
- 3
The divisors add up to 81408; without 80813 itself that is 595, so 80813 is deficient (595 is less than 80813). Euler's totient φ(80813) = 80220 numbers up to 80813 share no factor with it.
- 4
The digits of 80813 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80813 = 211 \times 383 \]
80813 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 81408 |
| Euler totient φ(n) | 80220 |
| Square | 6530740969 |
| Cube | 527768769927797 |
| Square root | 284.276274 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 138 |
| Scientific notation | 8.0813 × |
80813 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand eight hundred and thirteen |
| Binary (base 2) | 10011101110101101 |
| Octal (base 8) | 235655 |
| Hexadecimal (base 16) | 13BAD |
| Base 3 | 11002212002 |
| As time | 80813 seconds = 22 h 26 min 53 s |
Is 80813 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 3) | 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 5) | 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 2) | 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 7) | 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 80813 a prime number?
No. 80813 = 211 × 383, so it is divisible by 211.
What are the factors of 80813?
1, 211, 383, 80813.
What is 80813 in binary?
10011101110101101 (hexadecimal 13BAD, octal 235655).
What is the square root of 80813?
About 284.2763.
Is 80813 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 80813?
80813 is a semiprime: 211 × 383, the product of two primes.