8721911 has 16 divisors (see below), whose sum is σ = 9849600. Its totient is φ = 7656000.

The previous prime is 8721907. The next prime is 8721913. The reversal of 8721911 is 1191278.

8721911 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8721911 - 2² = 8721907 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 (8721913) 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 15 ways as a sum of consecutive naturals, for example, 57686 + ... + 57836.

It is an arithmetic number, because the mean of its divisors is an integer number (615600).

Almost surely, 2^8721911 is an apocalyptic number.

8721911 is a deficient number, since it is larger than the sum of its proper divisors (1127689).

8721911 is a wasteful number, since it uses less digits than its factorization.

8721911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310.

The product of its digits is 1008, while the sum is 29.

The square root of 8721911 is about 2953.2881674500. The cubic root of 8721911 is about 205.8435280819.

The spelling of 8721911 in words is "eight million, seven hundred twenty-one thousand, nine hundred eleven".