525

525 = 3 x 5² x 7.

525 in base 6 is 2233.

525 is a hexagonal pyramidal number (greengrocer's number).

525 is a number with exactly 12 divisors: 1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 175, 525.


Dionysius Exiguus produced his tables for computing the date of Easter in the year 525.

Source: The Positive Integers