The number 31498
31498 is a composite number with 4 divisors. Its prime factorisation is 2 × 15749. Divisors (4): 1, 2, 15749, 31498.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31498: a semiprime: 2 × 15749, the product of two primes.
- 2
31498 is composite. Its prime factorisation is
- 3
The divisors add up to 47250; without 31498 itself that is 15752, so 31498 is deficient (15752 is less than 31498). Euler's totient φ(31498) = 15748 numbers up to 31498 share no factor with it.
- 4
The digits of 31498 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 129 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31498 = 2 \times 15749 \]
31498 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 47250 |
| Euler totient φ(n) | 15748 |
| Square | 992124004 |
| Cube | 31249921877992 |
| Square root | 177.476759 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 129 |
| Scientific notation | 3.1498 × |
31498 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and ninety-eight |
| Binary (base 2) | 111101100001010 |
| Octal (base 8) | 75412 |
| Hexadecimal (base 16) | 7B0A |
| Base 3 | 1121012121 |
| As time | 31498 seconds = 8 h 44 min 58 s |
Is 31498 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31498 ÷ 2 = 15749) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 2) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31498 a prime number?
No. 31498 = 2 × 15749, so it is divisible by 2.
What are the factors of 31498?
1, 2, 15749, 31498.
What is 31498 in binary?
111101100001010 (hexadecimal 7B0A, octal 75412).
What is the square root of 31498?
About 177.4768.
Is 31498 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 31498?
31498 is a semiprime: 2 × 15749, the product of two primes.