The number 71321
71321 is a composite number with 4 divisors. Its prime factorisation is 73 × 977. Divisors (4): 1, 73, 977, 71321.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71321: a semiprime: 73 × 977, the product of two primes.
- 2
71321 is composite. Its prime factorisation is
- 3
The divisors add up to 72372; without 71321 itself that is 1051, so 71321 is deficient (1051 is less than 71321). Euler's totient φ(71321) = 70272 numbers up to 71321 share no factor with it.
- 4
The digits of 71321 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 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71321 = 73 \times 977 \]
71321 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 72372 |
| Euler totient φ(n) | 70272 |
| Square | 5086685041 |
| Cube | 362787463809161 |
| Square root | 267.059918 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.1321 × |
71321 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand three hundred and twenty-one |
| Binary (base 2) | 10001011010011001 |
| Octal (base 8) | 213231 |
| Hexadecimal (base 16) | 11699 |
| Base 3 | 10121211112 |
| As time | 71321 seconds = 19 h 48 min 41 s |
Is 71321 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 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 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 8) | 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 71321 a prime number?
No. 71321 = 73 × 977, so it is divisible by 73.
What are the factors of 71321?
1, 73, 977, 71321.
What is 71321 in binary?
10001011010011001 (hexadecimal 11699, octal 213231).
What is the square root of 71321?
About 267.0599.
Is 71321 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 71321?
71321 is a semiprime: 73 × 977, the product of two primes.