1216109611 has 8 divisors (see below), whose sum is σ = 1282106880. Its totient is φ = 1150311528.

The previous prime is 1216109591. The next prime is 1216109627. The reversal of 1216109611 is 1169016121.

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

It is not a de Polignac number, because 1216109611 - 2¹⁵ = 1216076843 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 1216109611.

It is not an unprimeable number, because it can be changed into a prime (1216109311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37171 + ... + 61756.

It is an arithmetic number, because the mean of its divisors is an integer number (160263360).

Almost surely, 2^1216109611 is an apocalyptic number.

1216109611 is a deficient number, since it is larger than the sum of its proper divisors (65997269).

1216109611 is an equidigital number, since it uses as much as digits as its factorization.

1216109611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99593.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1216109611 is about 34872.7631684098. The cubic root of 1216109611 is about 1067.3927293775.

The spelling of 1216109611 in words is "one billion, two hundred sixteen million, one hundred nine thousand, six hundred eleven".