128224913 has 4 divisors (see below), whose sum is σ = 128262720. Its totient is φ = 128187108.

The previous prime is 128224907. The next prime is 128224919. The reversal of 128224913 is 319422821.

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: 319422821 = 1301 ⋅245521.

It is an interprime number because it is at equal distance from previous prime (128224907) and next prime (128224919).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128224913 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 128224913.

It is not an unprimeable number, because it can be changed into a prime (128224919) 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, 13253 + ... + 20786.

It is an arithmetic number, because the mean of its divisors is an integer number (32065680).

Almost surely, 2^128224913 is an apocalyptic number.

It is an amenable number.

128224913 is a deficient number, since it is larger than the sum of its proper divisors (37807).

128224913 is an equidigital number, since it uses as much as digits as its factorization.

128224913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37806.

The product of its digits is 6912, while the sum is 32.

The square root of 128224913 is about 11323.6439806274. The cubic root of 128224913 is about 504.2634270522.

The spelling of 128224913 in words is "one hundred twenty-eight million, two hundred twenty-four thousand, nine hundred thirteen".