989536919391 has 32 divisors (see below), whose sum is σ = 1470355430400. Its totient is φ = 657723356640.

The previous prime is 989536919381. The next prime is 989536919407. The reversal of 989536919391 is 193919635989.

989536919391 is a `hidden beast` number, since 9 + 8 + 95 + 369 + 1 + 93 + 91 = 666.

It is not a de Polignac number, because 989536919391 - 2⁵ = 989536919359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989536919351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93638790 + ... + 93649356.

It is an arithmetic number, because the mean of its divisors is an integer number (45948607200).

Almost surely, 2^989536919391 is an apocalyptic number.

989536919391 is a deficient number, since it is larger than the sum of its proper divisors (480818511009).

989536919391 is a wasteful number, since it uses less digits than its factorization.

989536919391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20596 (or 20590 counting only the distinct ones).

The product of its digits is 127545840, while the sum is 72.

The spelling of 989536919391 in words is "nine hundred eighty-nine billion, five hundred thirty-six million, nine hundred nineteen thousand, three hundred ninety-one".