888888891 has 16 divisors (see below), whose sum is σ = 1306263168. Its totient is φ = 533164800.

The previous prime is 888888887. The next prime is 888888901. The reversal of 888888891 is 198888888.

It is not a de Polignac number, because 888888891 - 2² = 888888887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (888888821) 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, 135645 + ... + 142046.

It is an arithmetic number, because the mean of its divisors is an integer number (81641448).

Almost surely, 2^888888891 is an apocalyptic number.

888888891 is a deficient number, since it is larger than the sum of its proper divisors (417374277).

888888891 is a wasteful number, since it uses less digits than its factorization.

888888891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277802.

The product of its digits is 18874368, while the sum is 66.

The square root of 888888891 is about 29814.2397354016. The cubic root of 888888891 is about 961.4997142995.

It can be divided in two parts, 8888888 and 91, that multiplied together give a palindrome (808888808).

The spelling of 888888891 in words is "eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-one".