1216561102 has 8 divisors (see below), whose sum is σ = 1869350112. Its totient is φ = 593444400.

The previous prime is 1216561097. The next prime is 1216561111. The reversal of 1216561102 is 2011656121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 7417974 + ... + 7418137.

It is an arithmetic number, because the mean of its divisors is an integer number (233668764).

Almost surely, 2^1216561102 is an apocalyptic number.

1216561102 is a deficient number, since it is larger than the sum of its proper divisors (652789010).

1216561102 is a wasteful number, since it uses less digits than its factorization.

1216561102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14836154.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1216561102 is about 34879.2359721368. The cubic root of 1216561102 is about 1067.5248058998.

The spelling of 1216561102 in words is "one billion, two hundred sixteen million, five hundred sixty-one thousand, one hundred two".