1216222159 has 2 divisors, whose sum is σ = 1216222160. Its totient is φ = 1216222158.

The previous prime is 1216222151. The next prime is 1216222193. The reversal of 1216222159 is 9512226121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216222159 - 2³ = 1216222151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216222159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216222151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608111079 + 608111080.

It is an arithmetic number, because the mean of its divisors is an integer number (608111080).

Almost surely, 2^1216222159 is an apocalyptic number.

1216222159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216222159 is an equidigital number, since it uses as much as digits as its factorization.

1216222159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 1216222159 is about 34874.3768259735. The cubic root of 1216222159 is about 1067.4256565660.

The spelling of 1216222159 in words is "one billion, two hundred sixteen million, two hundred twenty-two thousand, one hundred fifty-nine".