85065809 has 2 divisors, whose sum is σ = 85065810. Its totient is φ = 85065808.

The previous prime is 85065797. The next prime is 85065821. The reversal of 85065809 is 90856058.

It is a balanced prime because it is at equal distance from previous prime (85065797) and next prime (85065821).

It can be written as a sum of positive squares in only one way, i.e., 82755409 + 2310400 = 9097^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 85065809 - 2¹⁶ = 85000273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85065839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42532904 + 42532905.

It is an arithmetic number, because the mean of its divisors is an integer number (42532905).

Almost surely, 2^85065809 is an apocalyptic number.

It is an amenable number.

85065809 is a deficient number, since it is larger than the sum of its proper divisors (1).

85065809 is an equidigital number, since it uses as much as digits as its factorization.

85065809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 85065809 is about 9223.1127608850. The cubic root of 85065809 is about 439.7964089107.

The spelling of 85065809 in words is "eighty-five million, sixty-five thousand, eight hundred nine".