1216646303 has 4 divisors (see below), whose sum is σ = 1228692408. Its totient is φ = 1204600200.

The previous prime is 1216646297. The next prime is 1216646311. The reversal of 1216646303 is 3036466121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216646303 - 2⁸ = 1216646047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216646303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216646363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6022901 + ... + 6023102.

It is an arithmetic number, because the mean of its divisors is an integer number (307173102).

Almost surely, 2^1216646303 is an apocalyptic number.

1216646303 is a deficient number, since it is larger than the sum of its proper divisors (12046105).

1216646303 is a wasteful number, since it uses less digits than its factorization.

1216646303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12046104.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1216646303 is about 34880.4573221166. The cubic root of 1216646303 is about 1067.5497264340.

The spelling of 1216646303 in words is "one billion, two hundred sixteen million, six hundred forty-six thousand, three hundred three".