98988891 has 8 divisors (see below), whose sum is σ = 132249600. Its totient is φ = 65860392.

The previous prime is 98988887. The next prime is 98988893. The reversal of 98988891 is 19888989.

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

It is not a de Polignac number, because 98988891 - 2² = 98988887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (98988893) 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 7 ways as a sum of consecutive naturals, for example, 31291 + ... + 34308.

It is an arithmetic number, because the mean of its divisors is an integer number (16531200).

Almost surely, 2^98988891 is an apocalyptic number.

98988891 is the 6293-rd centered pentagonal number.

98988891 is a deficient number, since it is larger than the sum of its proper divisors (33260709).

98988891 is a wasteful number, since it uses less digits than its factorization.

98988891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66105.

The product of its digits is 2985984, while the sum is 60.

The square root of 98988891 is about 9949.3161071503. The cubic root of 98988891 is about 462.5891969188.

The spelling of 98988891 in words is "ninety-eight million, nine hundred eighty-eight thousand, eight hundred ninety-one".