9809043385 has 4 divisors (see below), whose sum is σ = 11770852068. Its totient is φ = 7847234704.

The previous prime is 9809043373. The next prime is 9809043389. The reversal of 9809043385 is 5833409089.

9809043385 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 1097994496 + 8711048889 = 33136^2 + 93333^2 .

It is a cyclic number.

It is not a de Polignac number, because 9809043385 - 2¹¹ = 9809041337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9809043389) 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 3 ways as a sum of consecutive naturals, for example, 980904334 + ... + 980904343.

It is an arithmetic number, because the mean of its divisors is an integer number (2942713017).

Almost surely, 2^9809043385 is an apocalyptic number.

It is an amenable number.

9809043385 is a deficient number, since it is larger than the sum of its proper divisors (1961808683).

9809043385 is a wasteful number, since it uses less digits than its factorization.

9809043385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961808682.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 9809043385 is about 99040.6148254341. The cubic root of 9809043385 is about 2140.6330110514.

The spelling of 9809043385 in words is "nine billion, eight hundred nine million, forty-three thousand, three hundred eighty-five".