561

Names of 561

• Cardinal: 561 can be written as Five hundred sixty-one.

Scientific notation

• Scientific notation: 5.61 × 10²

Factors of 561

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 31

Divisors of 561

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 11 17 33 51 187 561
• Sum of all divisors σ(n): 864
• Sum of proper divisors (its aliquot sum) s(n): 303
• 561 is a deficient number, because the sum of its proper divisors (303) is less than itself. Its deficiency is 258

Bases of 561

• Binary: 1000110001₂
• Hexadecimal: 0x231
• Base-36: FL

Squares and roots of 561

• 561 squared (561²) is 314721
• 561 cubed (561³) is 176558481
• The square root of 561 is 23.6854385647
• The cube root of 561 is 8.2474739741

Scales and comparisons

• 561 seconds is equal to 9 minutes, 21 seconds.
• To count from 1 to 561 would take you about four minutes.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 561 cubic inches would be around 0.7 feet tall.

Recreational maths with 561

• 561 backwards is 165
• The number of decimal digits it has is: 3
• The sum of 561's digits is 12
• More coming soon!