9891384089 has 4 divisors (see below), whose sum is σ = 9891634356. Its totient is φ = 9891133824.

The previous prime is 9891384079. The next prime is 9891384103. The reversal of 9891384089 is 9804831989.

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 5193652489 + 4697731600 = 72067^2 + 68540^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891384089 - 2²⁴ = 9874606873 is a prime.

It is a super-2 number, since 2×9891384089² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9891384049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51344 + ... + 149729.

It is an arithmetic number, because the mean of its divisors is an integer number (2472908589).

Almost surely, 2^9891384089 is an apocalyptic number.

It is an amenable number.

9891384089 is a deficient number, since it is larger than the sum of its proper divisors (250267).

9891384089 is a wasteful number, since it uses less digits than its factorization.

9891384089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250266.

The product of its (nonzero) digits is 4478976, while the sum is 59.

The square root of 9891384089 is about 99455.4377045318. The cubic root of 9891384089 is about 2146.6060813111.

The spelling of 9891384089 in words is "nine billion, eight hundred ninety-one million, three hundred eighty-four thousand, eighty-nine".