8209081 has 2 divisors, whose sum is σ = 8209082. Its totient is φ = 8209080.

The previous prime is 8209063. The next prime is 8209099. The reversal of 8209081 is 1809028.

It is a balanced prime because it is at equal distance from previous prime (8209063) and next prime (8209099).

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 341056 = 2805^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 8209081 - 2¹⁹ = 7684793 is a prime.

It is a super-2 number, since 2×8209081² = 134778021729122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8209031) 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 as a sum of consecutive naturals, namely, 4104540 + 4104541.

It is an arithmetic number, because the mean of its divisors is an integer number (4104541).

Almost surely, 2^8209081 is an apocalyptic number.

It is an amenable number.

8209081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8209081 is an equidigital number, since it uses as much as digits as its factorization.

8209081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 8209081 is about 2865.1493852852. The cubic root of 8209081 is about 201.7273795149.

The spelling of 8209081 in words is "eight million, two hundred nine thousand, eighty-one".