991390421

Names of 991390421

• Cardinal: 991390421 can be written as Nine hundred ninety-one million, three hundred ninety thousand, four hundred twenty-one.

Scientific notation

• Scientific notation: 9.91390421 × 10⁸

Factors of 991390421

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 23923

Divisors of 991390421

• Number of divisors d(n): 8
• Complete list of divisors:
  1 7 10789 13127 75523 91889 141627203 991390421
• Sum of all divisors σ(n): 1133208960
• Sum of proper divisors (its aliquot sum) s(n): 141818539
• 991390421 is a deficient number, because the sum of its proper divisors (141818539) is less than itself. Its deficiency is 849571882

Bases of 991390421

• Binary: 111011000101110110101011010101₂
• Hexadecimal: 0x3B176AD5
• Base-36: GE8XQT

Squares and roots of 991390421

• 991390421 squared (991390421²) is 982854966850557241
• 991390421 cubed (991390421³) is 974392999367914987239588461
• The square root of 991390421 is 31486.3529326595
• The cube root of 991390421 is 997.1218646175

Scales and comparisons

• 991,390,421 seconds is equal to 31 years, 27 weeks, 1 day, 10 hours, 13 minutes, 41 seconds.
• To count from 1 to 991,390,421 would take you about forty-seven years!

  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 991390421 cubic inches would be around 83.1 feet tall.

Recreational maths with 991390421

• 991390421 backwards is 124093199
• The number of decimal digits it has is: 9
• The sum of 991390421's digits is 38
• More coming soon!