128243549113 has 4 divisors (see below), whose sum is σ = 128255232400. Its totient is φ = 128231865828.

The previous prime is 128243549107. The next prime is 128243549123. The reversal of 128243549113 is 311945342821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 311945342821 = 7 ⋅44563620403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128243549113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128243549113.

It is not an unprimeable number, because it can be changed into a prime (128243549123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5825163 + ... + 5847136.

It is an arithmetic number, because the mean of its divisors is an integer number (32063808100).

Almost surely, 2^128243549113 is an apocalyptic number.

It is an amenable number.

128243549113 is a deficient number, since it is larger than the sum of its proper divisors (11683287).

128243549113 is a wasteful number, since it uses less digits than its factorization.

128243549113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11683286.

The product of its digits is 207360, while the sum is 43.

The spelling of 128243549113 in words is "one hundred twenty-eight billion, two hundred forty-three million, five hundred forty-nine thousand, one hundred thirteen".