85573309 has 2 divisors, whose sum is σ = 85573310. Its totient is φ = 85573308.

The previous prime is 85573297. The next prime is 85573331. The reversal of 85573309 is 90337558.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83083225 + 2490084 = 9115^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 85573309 - 2¹⁵ = 85540541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85573339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42786654 + 42786655.

It is an arithmetic number, because the mean of its divisors is an integer number (42786655).

Almost surely, 2^85573309 is an apocalyptic number.

It is an amenable number.

85573309 is a deficient number, since it is larger than the sum of its proper divisors (1).

85573309 is an equidigital number, since it uses as much as digits as its factorization.

85573309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 85573309 is about 9250.5842518189. The cubic root of 85573309 is about 440.6692793152.

The spelling of 85573309 in words is "eighty-five million, five hundred seventy-three thousand, three hundred nine".