550128979 has 4 divisors (see below), whose sum is σ = 550317240. Its totient is φ = 549940720.

The previous prime is 550128947. The next prime is 550128989. The reversal of 550128979 is 979821055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979821055 = 5 ⋅195964211.

It is a cyclic number.

It is not a de Polignac number, because 550128979 - 2⁵ = 550128947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550128919) 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, 89677 + ... + 95614.

It is an arithmetic number, because the mean of its divisors is an integer number (137579310).

Almost surely, 2^550128979 is an apocalyptic number.

550128979 is a deficient number, since it is larger than the sum of its proper divisors (188261).

550128979 is a wasteful number, since it uses less digits than its factorization.

550128979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188260.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 550128979 is about 23454.8284794411. The cubic root of 550128979 is about 819.3853111938.

The spelling of 550128979 in words is "five hundred fifty million, one hundred twenty-eight thousand, nine hundred seventy-nine".