8085821 has 2 divisors, whose sum is σ = 8085822. Its totient is φ = 8085820.

The previous prime is 8085817. The next prime is 8085851. The reversal of 8085821 is 1285808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4622500 + 3463321 = 2150^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 8085821 - 2² = 8085817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8085851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4042910 + 4042911.

It is an arithmetic number, because the mean of its divisors is an integer number (4042911).

Almost surely, 2^8085821 is an apocalyptic number.

It is an amenable number.

8085821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8085821 is an equidigital number, since it uses as much as digits as its factorization.

8085821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 8085821 is about 2843.5578066922. The cubic root of 8085821 is about 200.7126327569.

The spelling of 8085821 in words is "eight million, eighty-five thousand, eight hundred twenty-one".