879892121 has 4 divisors (see below), whose sum is σ = 894316644. Its totient is φ = 865467600.

The previous prime is 879892099. The next prime is 879892129. The reversal of 879892121 is 121298978.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 354794896 + 525097225 = 18836^2 + 22915^2 .

It is a cyclic number.

It is not a de Polignac number, because 879892121 - 2¹⁸ = 879629977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (879892129) 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, 7212170 + ... + 7212291.

It is an arithmetic number, because the mean of its divisors is an integer number (223579161).

Almost surely, 2^879892121 is an apocalyptic number.

It is an amenable number.

879892121 is a deficient number, since it is larger than the sum of its proper divisors (14424523).

879892121 is a wasteful number, since it uses less digits than its factorization.

879892121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14424522.

The product of its digits is 145152, while the sum is 47.

The square root of 879892121 is about 29662.9755924789. The cubic root of 879892121 is about 958.2448112075.

The spelling of 879892121 in words is "eight hundred seventy-nine million, eight hundred ninety-two thousand, one hundred twenty-one".