1959

1959 = 3 x 653.

1959 is 132213 in base 4. It is 13023 in base 6.

1959 is a number n such that n1n and 1n1 are both prime (195911959 and 119591) (A090262).

1959 is the least value of n such that 51n contains only the digits 0 and 9 (A096688).

1959 is the largest integer that cannot be written as the sum of squares of integers larger than 17 (A193018).

1959 is the number of 2 x 2 integer matrices with entries from {0, 1, 2, ..., 40} having determinant 1 (A171503).

1959 was a year with exactly three "Friday the 13ths" (A190653).

Source: OEIS