1216569108 has 12 divisors (see below), whose sum is σ = 2838661280. Its totient is φ = 405523032.

The previous prime is 1216569089. The next prime is 1216569121. The reversal of 1216569108 is 8019656121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 50690368 + ... + 50690391.

Almost surely, 2^1216569108 is an apocalyptic number.

It is an amenable number.

1216569108 is an abundant number, since it is smaller than the sum of its proper divisors (1622092172).

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

1216569108 is a wasteful number, since it uses less digits than its factorization.

1216569108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101380766 (or 101380764 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1216569108 is about 34879.3507393701. The cubic root of 1216569108 is about 1067.5271476331.

The spelling of 1216569108 in words is "one billion, two hundred sixteen million, five hundred sixty-nine thousand, one hundred eight".