871891 has 8 divisors (see below), whose sum is σ = 928400. Its totient is φ = 816480.

The previous prime is 871883. The next prime is 871901. The reversal of 871891 is 198178.

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 871891 - 2³ = 871883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (874891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1861 + ... + 2281.

It is an arithmetic number, because the mean of its divisors is an integer number (116050).

2⁸⁷¹⁸⁹¹ is an apocalyptic number.

871891 is a deficient number, since it is larger than the sum of its proper divisors (56509).

871891 is a wasteful number, since it uses less digits than its factorization.

871891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its digits is 4032, while the sum is 34.

The square root of 871891 is about 933.7510374827. The cubic root of 871891 is about 95.5331427413.

It can be divided in two parts, 8 and 71891, that multiplied together give a triangular number (575128 = T₁₀₇₂).

The spelling of 871891 in words is "eight hundred seventy-one thousand, eight hundred ninety-one".