8916891921 has 12 divisors (see below), whose sum is σ = 14719948672. Its totient is φ = 5095366776.

The previous prime is 8916891889. The next prime is 8916891931. The reversal of 8916891921 is 1291986198.

8916891921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8916891921 - 2⁵ = 8916891889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8916891931) 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 11 ways as a sum of consecutive naturals, for example, 70768921 + ... + 70769046.

Almost surely, 2^8916891921 is an apocalyptic number.

It is an amenable number.

8916891921 is a deficient number, since it is larger than the sum of its proper divisors (5803056751).

8916891921 is a wasteful number, since it uses less digits than its factorization.

8916891921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141537980 (or 141537977 counting only the distinct ones).

The product of its digits is 559872, while the sum is 54.

The square root of 8916891921 is about 94429.2958832162. The cubic root of 8916891921 is about 2073.6613552726.

The spelling of 8916891921 in words is "eight billion, nine hundred sixteen million, eight hundred ninety-one thousand, nine hundred twenty-one".