1216109684 has 12 divisors (see below), whose sum is σ = 2131634400. Its totient is φ = 607071288.

The previous prime is 1216109663. The next prime is 1216109707. The reversal of 1216109684 is 4869016121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243104 + ... + 248055.

It is an arithmetic number, because the mean of its divisors is an integer number (177636200).

Almost surely, 2^1216109684 is an apocalyptic number.

It is an amenable number.

1216109684 is a deficient number, since it is larger than the sum of its proper divisors (915524716).

1216109684 is a wasteful number, since it uses less digits than its factorization.

1216109684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491782 (or 491780 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1216109684 is about 34872.7642150719. The cubic root of 1216109684 is about 1067.3927507351.

The spelling of 1216109684 in words is "one billion, two hundred sixteen million, one hundred nine thousand, six hundred eighty-four".