871881 has 4 divisors (see below), whose sum is σ = 1162512. Its totient is φ = 581252.

The previous prime is 871867. The next prime is 871883. The reversal of 871881 is 188178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 871881 - 2⁶ = 871817 is a prime.

It is a super-2 number, since 2×871881² = 1520352956322, which contains 22 as substring.

It is a D-number.

871881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (871883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145311 + ... + 145316.

It is an arithmetic number, because the mean of its divisors is an integer number (290628).

2⁸⁷¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

871881 is a deficient number, since it is larger than the sum of its proper divisors (290631).

871881 is a wasteful number, since it uses less digits than its factorization.

871881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290630.

The product of its digits is 3584, while the sum is 33.

The square root of 871881 is about 933.7456827209. The cubic root of 871881 is about 95.5327775064.

The spelling of 871881 in words is "eight hundred seventy-one thousand, eight hundred eighty-one".