98989891 has 24 divisors (see below), whose sum is σ = 133657344. Its totient is φ = 71192160.

The previous prime is 98989889. The next prime is 98989903. The reversal of 98989891 is 19898989.

It is not a de Polignac number, because 98989891 - 2¹ = 98989889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98989801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9210 + ... + 16816.

It is an arithmetic number, because the mean of its divisors is an integer number (5569056).

Almost surely, 2^98989891 is an apocalyptic number.

98989891 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

98989891 is a deficient number, since it is larger than the sum of its proper divisors (34667453).

98989891 is a wasteful number, since it uses less digits than its factorization.

98989891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651 (or 7638 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 61.

The square root of 98989891 is about 9949.3663617338. The cubic root of 98989891 is about 462.5907546277.

It can be divided in two parts, 989898 and 91, that added together give a palindrome (989989).

The spelling of 98989891 in words is "ninety-eight million, nine hundred eighty-nine thousand, eight hundred ninety-one".