1331

1331 is a natural number that comes after 1330 and before 1332. It is notable in mathematics for being the cube of 11: 1331 = 11^3. Because 11 is prime, 1331 has the prime factorization 11^3 and is a perfect cube.

It is a palindrome in decimal form, with the digits 1, 3, 3, 1 reading the same forward and backward. This also reflects the binomial coefficients in the expansion of (10+1)^3, which are 1, 3, 3, 1.

In different bases, 1331 has other interesting representations. In base 11, it equals 1000_11, since 11^3 equals 1331 in base 10. In binary it is 10100110011, and in hexadecimal it is 0x533. In Roman numerals it is MCCCXXXI.

Historically, 1331 is also the year 1331 CE, a point in the 14th century.