85520817 has 6 divisors (see below), whose sum is σ = 123530082. Its totient is φ = 57013872.

The previous prime is 85520807. The next prime is 85520819. The reversal of 85520817 is 71802558.

It can be written as a sum of positive squares in only one way, i.e., 61402896 + 24117921 = 7836^2 + 4911^2 .

It is not a de Polignac number, because 85520817 - 2⁶ = 85520753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85520819) 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 5 ways as a sum of consecutive naturals, for example, 4751148 + ... + 4751165.

It is an arithmetic number, because the mean of its divisors is an integer number (20588347).

Almost surely, 2^85520817 is an apocalyptic number.

It is an amenable number.

85520817 is a deficient number, since it is larger than the sum of its proper divisors (38009265).

85520817 is a wasteful number, since it uses less digits than its factorization.

85520817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9502319 (or 9502316 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 85520817 is about 9247.7465903862. The cubic root of 85520817 is about 440.5791564196.

The spelling of 85520817 in words is "eighty-five million, five hundred twenty thousand, eight hundred seventeen".