8721871 has 4 divisors (see below), whose sum is σ = 8732592. Its totient is φ = 8711152.

The previous prime is 8721851. The next prime is 8721877. The reversal of 8721871 is 1781278.

8721871 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.

It is a cyclic number.

It is not a de Polignac number, because 8721871 - 2⁹ = 8721359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721877) 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, 4030 + ... + 5803.

It is an arithmetic number, because the mean of its divisors is an integer number (2183148).

Almost surely, 2^8721871 is an apocalyptic number.

8721871 is a deficient number, since it is larger than the sum of its proper divisors (10721).

8721871 is an equidigital number, since it uses as much as digits as its factorization.

8721871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720.

The product of its digits is 6272, while the sum is 34.

The square root of 8721871 is about 2953.2813953296. The cubic root of 8721871 is about 205.8432134049.

The spelling of 8721871 in words is "eight million, seven hundred twenty-one thousand, eight hundred seventy-one".