9820065989 has 4 divisors (see below), whose sum is σ = 9821316780. Its totient is φ = 9818815200.

The previous prime is 9820065949. The next prime is 9820066027. The reversal of 9820065989 is 9895600289.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2739684964 + 7080381025 = 52342^2 + 84145^2 .

It is a cyclic number.

It is not a de Polignac number, because 9820065989 - 2⁸ = 9820065733 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 (9820065949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613544 + ... + 629345.

It is an arithmetic number, because the mean of its divisors is an integer number (2455329195).

Almost surely, 2^9820065989 is an apocalyptic number.

It is an amenable number.

9820065989 is a deficient number, since it is larger than the sum of its proper divisors (1250791).

9820065989 is a wasteful number, since it uses less digits than its factorization.

9820065989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250790.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The square root of 9820065989 is about 99096.2460893449. The cubic root of 9820065989 is about 2141.4345339047.

The spelling of 9820065989 in words is "nine billion, eight hundred twenty million, sixty-five thousand, nine hundred eighty-nine".