1216808287 has 2 divisors, whose sum is σ = 1216808288. Its totient is φ = 1216808286.

The previous prime is 1216808273. The next prime is 1216808309. The reversal of 1216808287 is 7828086121.

It is a weak prime.

It is an emirp because it is prime and its reverse (7828086121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216808287 - 2²⁷ = 1082590559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216808227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608404143 + 608404144.

It is an arithmetic number, because the mean of its divisors is an integer number (608404144).

Almost surely, 2^1216808287 is an apocalyptic number.

1216808287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216808287 is an equidigital number, since it uses as much as digits as its factorization.

1216808287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 1216808287 is about 34882.7792327389. The cubic root of 1216808287 is about 1067.5971021039.

The spelling of 1216808287 in words is "one billion, two hundred sixteen million, eight hundred eight thousand, two hundred eighty-seven".