871121 has 4 divisors (see below), whose sum is σ = 873012. Its totient is φ = 869232.

The previous prime is 871103. The next prime is 871147. The reversal of 871121 is 121178.

871121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121178 = 2 ⋅60589.

It can be written as a sum of positive squares in 2 ways, for example, as 698896 + 172225 = 836^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 871121 - 2¹⁰ = 870097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 871093 and 871102.

It is not an unprimeable number, because it can be changed into a prime (871181) 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, 251 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (218253).

2⁸⁷¹¹²¹ is an apocalyptic number.

It is an amenable number.

871121 is a deficient number, since it is larger than the sum of its proper divisors (1891).

871121 is a wasteful number, since it uses less digits than its factorization.

871121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890.

The product of its digits is 112, while the sum is 20.

The square root of 871121 is about 933.3386309373. The cubic root of 871121 is about 95.5050114783.

Adding to 871121 its reverse (121178), we get a palindrome (992299).

The spelling of 871121 in words is "eight hundred seventy-one thousand, one hundred twenty-one".