709

709 is a prime number.

709 has a representation as a sum of two squares: 709 = 15² + 22².

709 is the hypotenuse of a primitive Pythagorean triple: 709² = 259² + 660².

709 is the smallest prime of the form 59n + 1.

709 is the smallest prime whose cube is the sum of three prime cubes: 709³ = 193³ + 461³ + 631³.

709 is the number on General Esperanza's cargo plane in the movie Die Hard 2: Die Harder.

Source: Prime Curios!

160

160 = 2⁵ x 5.

160 has a representation as a sum of two squares: 160 = 4² + 12².

160 is the smallest number that is the sum of three distinct prime cubes: 160 = 2³ + 3³ + 5³.

160! - 159! + 158! - . . . -3! + 2! -1! is a prime number.

Each internal angle of a regular 18-sided polygon (octadecagon) is 160 degrees.

160 is the number of square rods in an acre.

Source: Prime Curios!

987

987 = 3 x 7 x 47.

987 is the 16th Fibonacci number.

987 is a divisor of 46⁶ - 1.

987 is the only three-digit number with consecutively decreasing digits such that when multiplied by the sum of its digits plus and minus 1, the results are primes: 987(9 + 8 + 7) - 1 = 23,687 and 987(9 + 8 + 7) + 1 = 23,689.

1 x 8 + 1 = 9

12 x 8 + 2 = 98

123 x 8 + 3 = 987

1234 x 8 + 4 = 9876

12345 x 8 + 5 = 98765

987 Hotels has hotels in Prague and Barcelona.

Source: Prime Curios!

1270

1270 = 2 x 5 x 127.

1270 is a divisor of 19⁶ - 1.

1270 is 1661 in base 9.

1270 is the sum of five positive fifth powers: 1270 = 4⁵ + 3⁵ + 1⁵ + 1⁵ + 1⁵.

1270 is a perfume produced by Frapin and named for the year in which the Frapin family established itself in the Cognac region of France.

Source: On-Line Encyclopedia of Integer Sequences

447

447 = 3 x 149.

447 is a divisor of 44⁴ - 1.

447 is the smallest number of convex quadrilaterals formed by 15 points in general position.

447 is 677 in base 8 and 377 in base 11. It is 313 in base 12.

447 is a number that cannot be written as a sum of three squares.

Air France Flight 447 from Rio de Janeiro to Paris crashed into the Atlantic Ocean on June 1, 2009.

Source: What's Special About This Number?

582

582 = 2 x 3 x 97.

582 is the number of antisymmetric relations on a five-element set.

582 is a divisor of 61³ - 1.

582 is 210120 in base 3 and 21012 in base 4.

582 is the sum of eight consecutive primes: 582 = 59 + 61 + 67 + 71 + 73 + 79 + 83 + 89.

The Rotax 582 is an engine designed for ultralight aircraft.

Source: What's Special About This Number?

276

276 = 2² x 3 x 23.

276 is the 23rd triangular number.

276 is the magic sum of a magic square made up of 16 consecutive primes.

276 is the largest difference between two consecutive primes less than 10⁹.

276 = 1⁵ + 2⁵ + 3⁵.

Loctite 276 is an adhesive for the permanent locking and sealing of threaded fasteners.

Source: Prime Curios!