The number 76121
76121 is a composite number with 4 divisors. Its prime factorisation is 163 × 467. Divisors (4): 1, 163, 467, 76121.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 76121: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 163 × 467, the product of two primes.
- 2
76121 is composite. Its prime factorisation is
- 3
The divisors add up to 76752; without 76121 itself that is 631, so 76121 is deficient (631 is less than 76121). Euler's totient φ(76121) = 75492 numbers up to 76121 share no factor with it.
- 4
The digits of 76121 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 63 steps to reach 1.
LaTeX source of the formulas on this page
\[ 76121 = 163 \times 467 \]
76121 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 76752 |
| Euler totient φ(n) | 75492 |
| Square | 5794406641 |
| Cube | 441076027919561 |
| Square root | 275.900344 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 63 |
| Scientific notation | 7.6121 × |
76121 in other forms
| Form | Value |
|---|---|
| In words | seventy-six thousand one hundred and twenty-one |
| Binary (base 2) | 10010100101011001 |
| Octal (base 8) | 224531 |
| Hexadecimal (base 16) | 12959 |
| Base 3 | 10212102022 |
| As time | 76121 seconds = 21 h 8 min 41 s |
Is 76121 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 2) | 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 5) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 76121 a prime number?
No. 76121 = 163 × 467, so it is divisible by 163.
What are the factors of 76121?
1, 163, 467, 76121.
What is 76121 in binary?
10010100101011001 (hexadecimal 12959, octal 224531).
What is the square root of 76121?
About 275.9003.
Is 76121 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 76121?
76121 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 163 × 467, the product of two primes.