1216085287 has 2 divisors, whose sum is σ = 1216085288. Its totient is φ = 1216085286.

The previous prime is 1216085261. The next prime is 1216085303. The reversal of 1216085287 is 7825806121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216085287 - 2¹⁹ = 1215560999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216085257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608042643 + 608042644.

It is an arithmetic number, because the mean of its divisors is an integer number (608042644).

Almost surely, 2^1216085287 is an apocalyptic number.

1216085287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216085287 is an equidigital number, since it uses as much as digits as its factorization.

1216085287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 1216085287 is about 34872.4144131146. The cubic root of 1216085287 is about 1067.3856128496.

The spelling of 1216085287 in words is "one billion, two hundred sixteen million, eighty-five thousand, two hundred eighty-seven".