The number 80489
80489 is a twin prime (80489 and 80491 are both prime) and the 7878th prime number. Its only divisors are 1 and 80489.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80489: a twin prime (80489 and 80491 are both prime); the 7878th prime number.
- 2
80489 is prime, so its only factors are 1 and 80489. It is the 7878th prime; the next prime is 80491 and the one before is 80473.
- 3
The divisors add up to 80490; without 80489 itself that is 1, so 80489 is deficient (1 is less than 80489). Euler's totient φ(80489) = 80488 numbers up to 80489 share no factor with it.
- 4
The digits of 80489 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 107 steps to reach 1.
80489 at a glance
| Property | Value |
|---|---|
| Type | prime |
| Number of divisors | 2 |
| Sum of divisors | 80490 |
| Euler totient φ(n) | 80488 |
| Square | 6478479121 |
| Cube | 521446305970169 |
| Square root | 283.705834 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 107 |
| Scientific notation | 8.0489 × |
80489 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand four hundred and eighty-nine |
| Binary (base 2) | 10011101001101001 |
| Octal (base 8) | 235151 |
| Hexadecimal (base 16) | 13A69 |
| Base 3 | 11002102002 |
| As time | 80489 seconds = 22 h 21 min 29 s |
Is 80489 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 4) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | 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 80489 a prime number?
Yes. 80489 is divisible only by 1 and itself.
What are the factors of 80489?
1, 80489.
What is 80489 in binary?
10011101001101001 (hexadecimal 13A69, octal 235151).
What is the square root of 80489?
About 283.7058.
Is 80489 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 80489?
80489 is a twin prime (80489 and 80491 are both prime); the 7878th prime number.