The number 49021
49021 is a composite number with 8 divisors. Its prime factorisation is 7 × 47 × 149. Divisors (8): 1, 7, 47, 149, 329, 1043, 7003, 49021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
49021 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
49021 is composite. Its prime factorisation is
- 3
The divisors add up to 57600; without 49021 itself that is 8579, so 49021 is deficient (8579 is less than 49021). Euler's totient φ(49021) = 40848 numbers up to 49021 share no factor with it.
- 4
The digits of 49021 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 65 steps to reach 1.
LaTeX source of the formulas on this page
\[ 49021 = 7 \times 47 \times 149 \]
49021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 57600 |
| Euler totient φ(n) | 40848 |
| Square | 2403058441 |
| Cube | 117800327836261 |
| Square root | 221.406865 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 65 |
| Scientific notation | 4.9021 × |
49021 in other forms
| Form | Value |
|---|---|
| In words | forty-nine thousand and twenty-one |
| Binary (base 2) | 1011111101111101 |
| Octal (base 8) | 137575 |
| Hexadecimal (base 16) | BF7D |
| Base 3 | 2111020121 |
| As time | 49021 seconds = 13 h 37 min 1 s |
Is 49021 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 1) | 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 | Yes (49021 ÷ 7 = 7003) | 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 7) | 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 5) | 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 49021 a prime number?
No. 49021 = 7 × 47 × 149, so it is divisible by 7.
What are the factors of 49021?
1, 7, 47, 149, 329, 1043, 7003, 49021.
What is 49021 in binary?
1011111101111101 (hexadecimal BF7D, octal 137575).
What is the square root of 49021?
About 221.4069.
Is 49021 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 49021?
It is a composite number with 8 divisors.