85565909 has 8 divisors (see below), whose sum is σ = 100525152. Its totient is φ = 71803440.

The previous prime is 85565813. The next prime is 85565917. The reversal of 85565909 is 90956558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85565909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85565959) 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 in 7 ways as a sum of consecutive naturals, for example, 299039 + ... + 299324.

It is an arithmetic number, because the mean of its divisors is an integer number (12565644).

Almost surely, 2^85565909 is an apocalyptic number.

It is an amenable number.

85565909 is a deficient number, since it is larger than the sum of its proper divisors (14959243).

85565909 is a wasteful number, since it uses less digits than its factorization.

85565909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598387.

The product of its (nonzero) digits is 486000, while the sum is 47.

The square root of 85565909 is about 9250.1842684349. The cubic root of 85565909 is about 440.6565765745.

The spelling of 85565909 in words is "eighty-five million, five hundred sixty-five thousand, nine hundred nine".