506

506 = 2 x 11 x 23.

506 is a pronic number because it is the product of two consecutive integers: 22 x 23 = 506.

506 is the sum of the first eleven squares: 1² + 2² + . . . + 10² + 11² = 506 (which makes it a square pyramidal number).

506 is a hendecagonal number.

The telephone area code 506 covers the Canadian province of New Brunswick.

Source: Number Gossip