1216315849 has 8 divisors (see below), whose sum is σ = 1402829120. Its totient is φ = 1032991056.

The previous prime is 1216315817. The next prime is 1216315871. The reversal of 1216315849 is 9485136121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216315849 - 2⁵ = 1216315817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216315889) 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, 796299 + ... + 797824.

It is an arithmetic number, because the mean of its divisors is an integer number (175353640).

Almost surely, 2^1216315849 is an apocalyptic number.

It is an amenable number.

1216315849 is a deficient number, since it is larger than the sum of its proper divisors (186513271).

1216315849 is a wasteful number, since it uses less digits than its factorization.

1216315849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594239.

The product of its digits is 51840, while the sum is 40.

The square root of 1216315849 is about 34875.7200499144. The cubic root of 1216315849 is about 1067.4530650843.

The spelling of 1216315849 in words is "one billion, two hundred sixteen million, three hundred fifteen thousand, eight hundred forty-nine".