The number 30997
30997 is a composite number with 4 divisors. Its prime factorisation is 139 × 223. Divisors (4): 1, 139, 223, 30997.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 30997: a semiprime: 139 × 223, the product of two primes.
- 2
30997 is composite. Its prime factorisation is
- 3
The divisors add up to 31360; without 30997 itself that is 363, so 30997 is deficient (363 is less than 30997). Euler's totient φ(30997) = 30636 numbers up to 30997 share no factor with it.
- 4
The digits of 30997 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 54 steps to reach 1.
LaTeX source of the formulas on this page
\[ 30997 = 139 \times 223 \]
30997 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 31360 |
| Euler totient φ(n) | 30636 |
| Square | 960814009 |
| Cube | 29782351836973 |
| Square root | 176.059649 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 54 |
| Scientific notation | 3.0997 × |
30997 in other forms
| Form | Value |
|---|---|
| In words | thirty thousand nine hundred and ninety-seven |
| Binary (base 2) | 111100100010101 |
| Octal (base 8) | 74425 |
| Hexadecimal (base 16) | 7915 |
| Base 3 | 1120112001 |
| As time | 30997 seconds = 8 h 36 min 37 s |
Is 30997 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 2) | 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 1) | 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 7) | 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 30997 a prime number?
No. 30997 = 139 × 223, so it is divisible by 139.
What are the factors of 30997?
1, 139, 223, 30997.
What is 30997 in binary?
111100100010101 (hexadecimal 7915, octal 74425).
What is the square root of 30997?
About 176.0596.
Is 30997 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 30997?
30997 is a semiprime: 139 × 223, the product of two primes.