1216116326 has 16 divisors (see below), whose sum is σ = 1835038800. Its totient is φ = 604448160.

The previous prime is 1216116289. The next prime is 1216116347. The reversal of 1216116326 is 6236116121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239696 + ... + 244716.

It is an arithmetic number, because the mean of its divisors is an integer number (114689925).

Almost surely, 2^1216116326 is an apocalyptic number.

1216116326 is a deficient number, since it is larger than the sum of its proper divisors (618922474).

1216116326 is a wasteful number, since it uses less digits than its factorization.

1216116326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719.

The product of its digits is 2592, while the sum is 29.

The square root of 1216116326 is about 34872.8594468535. The cubic root of 1216116326 is about 1067.3946939836.

The spelling of 1216116326 in words is "one billion, two hundred sixteen million, one hundred sixteen thousand, three hundred twenty-six".