1216564122 has 16 divisors (see below), whose sum is σ = 2439910080. Its totient is φ = 404391072.

The previous prime is 1216564109. The next prime is 1216564133. The reversal of 1216564122 is 2214656121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216564122.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 280243 + ... + 284550.

It is an arithmetic number, because the mean of its divisors is an integer number (152494380).

Almost surely, 2^1216564122 is an apocalyptic number.

1216564122 is an abundant number, since it is smaller than the sum of its proper divisors (1223345958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216564122 is a wasteful number, since it uses less digits than its factorization.

1216564122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565157.

The product of its digits is 5760, while the sum is 30.

The square root of 1216564122 is about 34879.2792643426. The cubic root of 1216564122 is about 1067.5256892428.

The spelling of 1216564122 in words is "one billion, two hundred sixteen million, five hundred sixty-four thousand, one hundred twenty-two".