1216623219 has 16 divisors (see below), whose sum is σ = 1951476480. Its totient is φ = 658622880.

The previous prime is 1216623193. The next prime is 1216623227. The reversal of 1216623219 is 9123266121.

It is not a de Polignac number, because 1216623219 - 2⁷ = 1216623091 is a prime.

It is a super-2 number, since 2×1216623219² = 2960344114019843922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1216623219.

It is not an unprimeable number, because it can be changed into a prime (1216623259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1524192 + ... + 1524989.

It is an arithmetic number, because the mean of its divisors is an integer number (121967280).

Almost surely, 2^1216623219 is an apocalyptic number.

1216623219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1216623219 is a deficient number, since it is larger than the sum of its proper divisors (734853261).

1216623219 is a wasteful number, since it uses less digits than its factorization.

1216623219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049210.

The product of its digits is 7776, while the sum is 33.

The square root of 1216623219 is about 34880.1264189223. The cubic root of 1216623219 is about 1067.5429746844.

The spelling of 1216623219 in words is "one billion, two hundred sixteen million, six hundred twenty-three thousand, two hundred nineteen".