1216608185 has 12 divisors (see below), whose sum is σ = 1580871852. Its totient is φ = 898417728.

The previous prime is 1216608167. The next prime is 1216608221. The reversal of 1216608185 is 5818066121.

It can be written as a sum of positive squares in 6 ways, for example, as 133079296 + 1083528889 = 11536^2 + 32917^2 .

It is not a de Polignac number, because 1216608185 - 2⁶ = 1216608121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 719042 + ... + 720731.

It is an arithmetic number, because the mean of its divisors is an integer number (131739321).

Almost surely, 2^1216608185 is an apocalyptic number.

It is an amenable number.

1216608185 is a deficient number, since it is larger than the sum of its proper divisors (364263667).

1216608185 is a wasteful number, since it uses less digits than its factorization.

1216608185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439804 (or 1439791 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1216608185 is about 34879.9109087165. The cubic root of 1216608185 is about 1067.5385774021.

The spelling of 1216608185 in words is "one billion, two hundred sixteen million, six hundred eight thousand, one hundred eighty-five".