879189121 has 4 divisors (see below), whose sum is σ = 879249492. Its totient is φ = 879128752.

The previous prime is 879189089. The next prime is 879189161. The reversal of 879189121 is 121981978.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 104346225 + 774842896 = 10215^2 + 27836^2 .

It is a cyclic number.

It is not a de Polignac number, because 879189121 - 2⁵ = 879189089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (879189161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615 + ... + 42451.

It is an arithmetic number, because the mean of its divisors is an integer number (219812373).

Almost surely, 2^879189121 is an apocalyptic number.

It is an amenable number.

879189121 is a deficient number, since it is larger than the sum of its proper divisors (60371).

879189121 is a wasteful number, since it uses less digits than its factorization.

879189121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60370.

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

The square root of 879189121 is about 29651.1234357149. The cubic root of 879189121 is about 957.9895429492.

The spelling of 879189121 in words is "eight hundred seventy-nine million, one hundred eighty-nine thousand, one hundred twenty-one".