9897557989 has 16 divisors (see below), whose sum is σ = 10988046720. Its totient is φ = 8839224000.

The previous prime is 9897557959. The next prime is 9897557993.

9897557989 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 9897557989 - 2⁷ = 9897557861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897557909) 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, 554179 + ... + 571759.

It is an arithmetic number, because the mean of its divisors is an integer number (686752920).

Almost surely, 2^9897557989 is an apocalyptic number.

It is an amenable number.

9897557989 is a deficient number, since it is larger than the sum of its proper divisors (1090488731).

9897557989 is a wasteful number, since it uses less digits than its factorization.

9897557989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18492.

The product of its digits is 514382400, while the sum is 76.

The square root of 9897557989 is about 99486.4713868172. The cubic root of 9897557989 is about 2147.0526037513.

The spelling of 9897557989 in words is "nine billion, eight hundred ninety-seven million, five hundred fifty-seven thousand, nine hundred eighty-nine".