8891618121 has 48 divisors (see below), whose sum is σ = 13395013632. Its totient is φ = 5677516800.

The previous prime is 8891618101. The next prime is 8891618143. The reversal of 8891618121 is 1218161988.

8891618121 is a `hidden beast` number, since 8 + 8 + 9 + 1 + 618 + 1 + 21 = 666.

8891618121 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 8891618121 - 2¹³ = 8891609929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8891618101) 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 47 ways as a sum of consecutive naturals, for example, 14994001 + ... + 14994593.

It is an arithmetic number, because the mean of its divisors is an integer number (279062784).

Almost surely, 2^8891618121 is an apocalyptic number.

It is an amenable number.

8891618121 is a deficient number, since it is larger than the sum of its proper divisors (4503395511).

8891618121 is a wasteful number, since it uses less digits than its factorization.

8891618121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094 (or 1091 counting only the distinct ones).

The product of its digits is 55296, while the sum is 45.

The square root of 8891618121 is about 94295.3769863613. The cubic root of 8891618121 is about 2071.7003245763.

The spelling of 8891618121 in words is "eight billion, eight hundred ninety-one million, six hundred eighteen thousand, one hundred twenty-one".