8721133 has 4 divisors (see below), whose sum is σ = 9180160. Its totient is φ = 8262108.

The previous prime is 8721121. The next prime is 8721157. The reversal of 8721133 is 3311278.

8721133 is digitally balanced in base 3, 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 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 8721133 - 2⁵ = 8721101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8721098 and 8721107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721533) 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, 229485 + ... + 229522.

It is an arithmetic number, because the mean of its divisors is an integer number (2295040).

Almost surely, 2^8721133 is an apocalyptic number.

It is an amenable number.

8721133 is a deficient number, since it is larger than the sum of its proper divisors (459027).

8721133 is a wasteful number, since it uses less digits than its factorization.

8721133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459026.

The product of its digits is 1008, while the sum is 25.

The square root of 8721133 is about 2953.1564469225. The cubic root of 8721133 is about 205.8374074421.

The spelling of 8721133 in words is "eight million, seven hundred twenty-one thousand, one hundred thirty-three".