9898028502891 has 4 divisors (see below), whose sum is σ = 13197371337192. Its totient is φ = 6598685668592.

The previous prime is 9898028502881. The next prime is 9898028502911. The reversal of 9898028502891 is 1982058208989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9898028502891 - 2¹⁵ = 9898028470123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9898028502821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649671417146 + ... + 1649671417151.

It is an arithmetic number, because the mean of its divisors is an integer number (3299342834298).

Almost surely, 2^{9898028502891} is an apocalyptic number.

9898028502891 is a deficient number, since it is larger than the sum of its proper divisors (3299342834301).

9898028502891 is a wasteful number, since it uses less digits than its factorization.

9898028502891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299342834300.

The product of its (nonzero) digits is 59719680, while the sum is 69.

The spelling of 9898028502891 in words is "nine trillion, eight hundred ninety-eight billion, twenty-eight million, five hundred two thousand, eight hundred ninety-one".