8918821 has 2 divisors, whose sum is σ = 8918822. Its totient is φ = 8918820.

The previous prime is 8918797. The next prime is 8918827. The reversal of 8918821 is 1288198.

8918821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6076225 + 2842596 = 2465^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 8918821 - 2¹⁷ = 8787749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8918827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4459410 + 4459411.

It is an arithmetic number, because the mean of its divisors is an integer number (4459411).

Almost surely, 2^8918821 is an apocalyptic number.

It is an amenable number.

8918821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8918821 is an equidigital number, since it uses as much as digits as its factorization.

8918821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 37.

The square root of 8918821 is about 2986.4395188920. The cubic root of 8918821 is about 207.3810883014.

The spelling of 8918821 in words is "eight million, nine hundred eighteen thousand, eight hundred twenty-one".