1216868917 has 8 divisors (see below), whose sum is σ = 1330841952. Its totient is φ = 1103454000.

The previous prime is 1216868909. The next prime is 1216868921. The reversal of 1216868917 is 7198686121.

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

It is not a de Polignac number, because 1216868917 - 2³ = 1216868909 is a prime.

It is a super-2 number, since 2×1216868917² = 2961539922321505778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216868957) 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, 134959 + ... + 143692.

It is an arithmetic number, because the mean of its divisors is an integer number (166355244).

Almost surely, 2^1216868917 is an apocalyptic number.

It is an amenable number.

1216868917 is a deficient number, since it is larger than the sum of its proper divisors (113973035).

1216868917 is a wasteful number, since it uses less digits than its factorization.

1216868917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279059.

The product of its digits is 290304, while the sum is 49.

The square root of 1216868917 is about 34883.6482753740. The cubic root of 1216868917 is about 1067.6148335570.

The spelling of 1216868917 in words is "one billion, two hundred sixteen million, eight hundred sixty-eight thousand, nine hundred seventeen".