ⓘ 130 (number)

                                     

ⓘ 130 (number)

130 is a sphenic number. It is a noncototient since there is no answer to the equation x - φx = 130.

130 is the only integer that is the sum of the squares of its first four divisors, including 1: 1 2 + 2 + 5 2 + 10 2 = 130.

130 is the largest number that cannot be written as the sum of four hexagonal numbers.

130 equals both 2 7 + 2 and 5 3 + 5 and is therefore a doubly strictly adsurd number.

                                     

1. In other fields

One hundred thirty is also:

  • A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle
  • The year AD 130 or 130 BC
  • The C130 Hercules aircraft
  • The 130 nanometer process is a semiconductor process technology by semiconductor companies