989731009 has 8 divisors (see below), whose sum is σ = 1042240320. Its totient is φ = 938011536.

The previous prime is 989731003. The next prime is 989731027. The reversal of 989731009 is 900137989.

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

It is a cyclic number.

It is not a de Polignac number, because 989731009 - 2²⁹ = 452860097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989731009.

It is not an unprimeable number, because it can be changed into a prime (989731003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194887 + ... + 199900.

It is an arithmetic number, because the mean of its divisors is an integer number (130280040).

Almost surely, 2^989731009 is an apocalyptic number.

It is an amenable number.

989731009 is a deficient number, since it is larger than the sum of its proper divisors (52509311).

989731009 is a wasteful number, since it uses less digits than its factorization.

989731009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394919.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 989731009 is about 31459.9906071188. The cubic root of 989731009 is about 996.5652187855.

The spelling of 989731009 in words is "nine hundred eighty-nine million, seven hundred thirty-one thousand, nine".