The number 31197
31197 is a composite number with 4 divisors. Its prime factorisation is 3 × 10399. Divisors (4): 1, 3, 10399, 31197.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31197: a semiprime: 3 × 10399, the product of two primes.
- 2
31197 is composite. Its prime factorisation is
- 3
The divisors add up to 41600; without 31197 itself that is 10403, so 31197 is deficient (10403 is less than 31197). Euler's totient φ(31197) = 20796 numbers up to 31197 share no factor with it.
- 4
The digits of 31197 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 147 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31197 = 3 \times 10399 \]
31197 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 41600 |
| Euler totient φ(n) | 20796 |
| Square | 973252809 |
| Cube | 30362567882373 |
| Square root | 176.626725 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 147 |
| Scientific notation | 3.1197 × |
31197 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand one hundred and ninety-seven |
| Binary (base 2) | 111100111011101 |
| Octal (base 8) | 74735 |
| Hexadecimal (base 16) | 79DD |
| Base 3 | 1120210110 |
| As time | 31197 seconds = 8 h 39 min 57 s |
Is 31197 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 | Yes (31197 ÷ 3 = 10399) | 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 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31197 a prime number?
No. 31197 = 3 × 10399, so it is divisible by 3.
What are the factors of 31197?
1, 3, 10399, 31197.
What is 31197 in binary?
111100111011101 (hexadecimal 79DD, octal 74735).
What is the square root of 31197?
About 176.6267.
Is 31197 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 31197?
31197 is a semiprime: 3 × 10399, the product of two primes.