451

451 = 11 x41.

451 is a decagonal number. It is also a centered decagonal number.

10⁴⁵¹ + 451 is a prime number.

3 plus the integer formed by the first 451 digits after the decimal point in pi is a prime number.

The title of the novel and film Fahrenheit 451 refers to the temperature at which book paper supposedly burns.

Source: Prime Curios!