989143509 has 8 divisors (see below), whose sum is σ = 1319443840. Its totient is φ = 659136096.

The previous prime is 989143481. The next prime is 989143511. The reversal of 989143509 is 905341989.

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

It is not a de Polignac number, because 989143509 - 2⁹ = 989142997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989143109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65224 + ... + 78945.

It is an arithmetic number, because the mean of its divisors is an integer number (164930480).

Almost surely, 2^989143509 is an apocalyptic number.

It is an amenable number.

989143509 is a deficient number, since it is larger than the sum of its proper divisors (330300331).

989143509 is a wasteful number, since it uses less digits than its factorization.

989143509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146459.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 989143509 is about 31450.6519646255. The cubic root of 989143509 is about 996.3679941708.

The spelling of 989143509 in words is "nine hundred eighty-nine million, one hundred forty-three thousand, five hundred nine".