8128443489 has 4 divisors (see below), whose sum is σ = 10837924656. Its totient is φ = 5418962324.

The previous prime is 8128443469. The next prime is 8128443541. The reversal of 8128443489 is 9843448218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8128443489 - 2⁷ = 8128443361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8128443419) 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, 1354740579 + ... + 1354740584.

It is an arithmetic number, because the mean of its divisors is an integer number (2709481164).

Almost surely, 2^8128443489 is an apocalyptic number.

It is an amenable number.

8128443489 is a deficient number, since it is larger than the sum of its proper divisors (2709481167).

8128443489 is a wasteful number, since it uses less digits than its factorization.

8128443489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709481166.

The product of its digits is 1769472, while the sum is 51.

The square root of 8128443489 is about 90157.8809034463. The cubic root of 8128443489 is about 2010.6468458470.

The spelling of 8128443489 in words is "eight billion, one hundred twenty-eight million, four hundred forty-three thousand, four hundred eighty-nine".