8550821 has 2 divisors, whose sum is σ = 8550822. Its totient is φ = 8550820.

The previous prime is 8550803. The next prime is 8550827. The reversal of 8550821 is 1280558.

8550821 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., 4669921 + 3880900 = 2161^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 8550821 - 2¹⁰ = 8549797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8550827) 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 as a sum of consecutive naturals, namely, 4275410 + 4275411.

It is an arithmetic number, because the mean of its divisors is an integer number (4275411).

Almost surely, 2^8550821 is an apocalyptic number.

It is an amenable number.

8550821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8550821 is an equidigital number, since it uses as much as digits as its factorization.

8550821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 8550821 is about 2924.1786881106. The cubic root of 8550821 is about 204.4886800963.

The spelling of 8550821 in words is "eight million, five hundred fifty thousand, eight hundred twenty-one".