1216116311 has 4 divisors (see below), whose sum is σ = 1227481992. Its totient is φ = 1204750632.

The previous prime is 1216116289. The next prime is 1216116347. The reversal of 1216116311 is 1136116121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216116311 - 2²² = 1211922007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216116611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5682680 + ... + 5682893.

It is an arithmetic number, because the mean of its divisors is an integer number (306870498).

Almost surely, 2^1216116311 is an apocalyptic number.

1216116311 is a deficient number, since it is larger than the sum of its proper divisors (11365681).

1216116311 is a wasteful number, since it uses less digits than its factorization.

1216116311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11365680.

The product of its digits is 216, while the sum is 23.

The square root of 1216116311 is about 34872.8592317865. The cubic root of 1216116311 is about 1067.3946895950.

The spelling of 1216116311 in words is "one billion, two hundred sixteen million, one hundred sixteen thousand, three hundred eleven".