85009709 has 2 divisors, whose sum is σ = 85009710. Its totient is φ = 85009708.

The previous prime is 85009703. The next prime is 85009723. The reversal of 85009709 is 90790058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 20448484 = 8035^2 + 4522^2 .

It is a cyclic number.

It is not a de Polignac number, because 85009709 - 2⁸ = 85009453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85009703) 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, 42504854 + 42504855.

It is an arithmetic number, because the mean of its divisors is an integer number (42504855).

Almost surely, 2^85009709 is an apocalyptic number.

It is an amenable number.

85009709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85009709 is an equidigital number, since it uses as much as digits as its factorization.

85009709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 85009709 is about 9220.0709867115. The cubic root of 85009709 is about 439.6997072919.

The spelling of 85009709 in words is "eighty-five million, nine thousand, seven hundred nine".