491 ( four hundred and ninety-one ) is a natural number located between 490 and 492.
| 491 | |
|---|---|
| four hundred and ninety one | |
| ← 489 · 490 · 491 · 492 · 493 → | |
| Factorization | simple |
| Roman notation | CDXCI |
| Binary | 111101011 |
| Octal | 753 |
| Hexadecimal | 1EB |
In Math
- 491 is an odd three-digit number.
- The sum of the digits of 491 is 14 .
- The product of the digits of this number is 36 .
- The square of this number is 241 081.
- The number 491 is a prime number [1] .
- 491 is the prime number of Sophie Germain [2] .
- 491 is the Eisenstein prime number [3] without the imaginary part.
- 491 is a Chen prime number [4] .
- The number 491 3 + 2 is prime [5] .
In other areas
- 491 year
- 491 year BC e.
- NGC 491 - The galaxy in the constellation Sculptor .
- (491) Karina is the asteroid of the main belt.
- 491st Separate Engineer Battalion
Notes
- ↑ The Number 491 .
- ↑ sequence A005384 in OEIS .
- ↑ sequence A003627 in OEIS .
- ↑ sequence A109611 in OEIS .
- ↑ sequence A067200 in OEIS .