The number 98821
98821 is a composite number with 4 divisors. Its prime factorisation is 17 × 5813. Divisors (4): 1, 17, 5813, 98821.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 98821: a semiprime: 17 × 5813, the product of two primes.
- 2
98821 is composite. Its prime factorisation is
- 3
The divisors add up to 104652; without 98821 itself that is 5831, so 98821 is deficient (5831 is less than 98821). Euler's totient φ(98821) = 92992 numbers up to 98821 share no factor with it.
- 4
The digits of 98821 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 146 steps to reach 1.
LaTeX source of the formulas on this page
\[ 98821 = 17 \times 5813 \]
98821 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 104652 |
| Euler totient φ(n) | 92992 |
| Square | 9765590041 |
| Cube | 965045373441661 |
| Square root | 314.358076 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 146 |
| Scientific notation | 9.8821 × |
98821 in other forms
| Form | Value |
|---|---|
| In words | ninety-eight thousand eight hundred and twenty-one |
| Binary (base 2) | 11000001000000101 |
| Octal (base 8) | 301005 |
| Hexadecimal (base 16) | 18205 |
| Base 3 | 12000120001 |
| As time | 98821 seconds = 27 h 27 min 1 s |
Is 98821 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 1) | 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 2) | 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 1) | 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 8) | 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 98821 a prime number?
No. 98821 = 17 × 5813, so it is divisible by 17.
What are the factors of 98821?
1, 17, 5813, 98821.
What is 98821 in binary?
11000001000000101 (hexadecimal 18205, octal 301005).
What is the square root of 98821?
About 314.3581.
Is 98821 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 98821?
98821 is a semiprime: 17 × 5813, the product of two primes.