The number 15501
15501 is a composite number with 4 divisors. Its prime factorisation is 3 × 5167. Divisors (4): 1, 3, 5167, 15501.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 15501: a semiprime: 3 × 5167, the product of two primes.
- 2
15501 is composite. Its prime factorisation is
- 3
The divisors add up to 20672; without 15501 itself that is 5171, so 15501 is deficient (5171 is less than 15501). Euler's totient φ(15501) = 10332 numbers up to 15501 share no factor with it.
- 4
The digits of 15501 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 53 steps to reach 1.
LaTeX source of the formulas on this page
\[ 15501 = 3 \times 5167 \]
15501 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 20672 |
| Euler totient φ(n) | 10332 |
| Square | 240281001 |
| Cube | 3724595796501 |
| Square root | 124.503012 |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 53 |
| Scientific notation | 1.5501 × |
15501 in other forms
| Form | Value |
|---|---|
| In words | fifteen thousand five hundred and one |
| Binary (base 2) | 11110010001101 |
| Octal (base 8) | 36215 |
| Hexadecimal (base 16) | 3C8D |
| Base 3 | 210021010 |
| As time | 15501 seconds = 4 h 18 min 21 s |
Is 15501 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 (15501 ÷ 3 = 5167) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | 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 15501 a prime number?
No. 15501 = 3 × 5167, so it is divisible by 3.
What are the factors of 15501?
1, 3, 5167, 15501.
What is 15501 in binary?
11110010001101 (hexadecimal 3C8D, octal 36215).
What is the square root of 15501?
About 124.5030.
Is 15501 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 15501?
15501 is a semiprime: 3 × 5167, the product of two primes.