The number 91321
91321 is a composite number with 8 divisors. Its prime factorisation is 29 × 47 × 67. Divisors (8): 1, 29, 47, 67, 1363, 1943, 3149, 91321.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
91321 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
91321 is composite. Its prime factorisation is
- 3
The divisors add up to 97920; without 91321 itself that is 6599, so 91321 is deficient (6599 is less than 91321). Euler's totient φ(91321) = 85008 numbers up to 91321 share no factor with it.
- 4
The digits of 91321 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 169 steps to reach 1.
LaTeX source of the formulas on this page
\[ 91321 = 29 \times 47 \times 67 \]
91321 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 97920 |
| Euler totient φ(n) | 85008 |
| Square | 8339525041 |
| Cube | 761573766269161 |
| Square root | 302.193647 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 169 |
| Scientific notation | 9.1321 × |
91321 in other forms
| Form | Value |
|---|---|
| In words | ninety-one thousand three hundred and twenty-one |
| Binary (base 2) | 10110010010111001 |
| Octal (base 8) | 262271 |
| Hexadecimal (base 16) | 164B9 |
| Base 3 | 11122021021 |
| As time | 91321 seconds = 25 h 22 min 1 s |
Is 91321 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 6) | 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 7) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 91321 a prime number?
No. 91321 = 29 × 47 × 67, so it is divisible by 29.
What are the factors of 91321?
1, 29, 47, 67, 1363, 1943, 3149, 91321.
What is 91321 in binary?
10110010010111001 (hexadecimal 164B9, octal 262271).
What is the square root of 91321?
About 302.1936.
Is 91321 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 91321?
It is a composite number with 8 divisors.