871891121 has 8 divisors (see below), whose sum is σ = 923752800. Its totient is φ = 820093248.

The previous prime is 871891103. The next prime is 871891127. The reversal of 871891121 is 121198178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 871891121 - 2¹⁸ = 871628977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (871891127) 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 7 ways as a sum of consecutive naturals, for example, 13790 + ... + 43976.

It is an arithmetic number, because the mean of its divisors is an integer number (115469100).

Almost surely, 2^871891121 is an apocalyptic number.

It is an amenable number.

871891121 is a deficient number, since it is larger than the sum of its proper divisors (51861679).

871891121 is a wasteful number, since it uses less digits than its factorization.

871891121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31903.

The product of its digits is 8064, while the sum is 38.

The square root of 871891121 is about 29527.8025088221. The cubic root of 871891121 is about 955.3314716067.

The spelling of 871891121 in words is "eight hundred seventy-one million, eight hundred ninety-one thousand, one hundred twenty-one".