989381912997 has 16 divisors (see below), whose sum is σ = 1399206251520. Its totient is φ = 620102761200.

The previous prime is 989381912989. The next prime is 989381913001. The reversal of 989381912997 is 799219183989.

It is not a de Polignac number, because 989381912997 - 2³ = 989381912989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989381912917) 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, 66242829 + ... + 66257762.

It is an arithmetic number, because the mean of its divisors is an integer number (87450390720).

Almost surely, 2^989381912997 is an apocalyptic number.

It is an amenable number.

989381912997 is a deficient number, since it is larger than the sum of its proper divisors (409824338523).

989381912997 is a wasteful number, since it uses less digits than its factorization.

989381912997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132500744.

The product of its digits is 158723712, while the sum is 75.

The spelling of 989381912997 in words is "nine hundred eighty-nine billion, three hundred eighty-one million, nine hundred twelve thousand, nine hundred ninety-seven".