128891179 has 4 divisors (see below), whose sum is σ = 128916040. Its totient is φ = 128866320.

The previous prime is 128891159. The next prime is 128891197. The reversal of 128891179 is 971198821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 971198821 = 7901 ⋅122921.

It is a cyclic number.

It is not a de Polignac number, because 128891179 - 2¹⁹ = 128366891 is a prime.

It is a super-2 number, since 2×128891179² = 33225872048020082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128891159) 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, 1377 + ... + 16114.

It is an arithmetic number, because the mean of its divisors is an integer number (32229010).

Almost surely, 2^128891179 is an apocalyptic number.

128891179 is a deficient number, since it is larger than the sum of its proper divisors (24861).

128891179 is an equidigital number, since it uses as much as digits as its factorization.

128891179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24860.

The product of its digits is 72576, while the sum is 46.

The square root of 128891179 is about 11353.0251034691. The cubic root of 128891179 is about 505.1353151751.

The spelling of 128891179 in words is "one hundred twenty-eight million, eight hundred ninety-one thousand, one hundred seventy-nine".