85173813 has 12 divisors (see below), whose sum is σ = 123110988. Its totient is φ = 56744640.

The previous prime is 85173797. The next prime is 85173821. The reversal of 85173813 is 31837158.

It can be written as a sum of positive squares in 2 ways, for example, as 14311089 + 70862724 = 3783^2 + 8418^2 .

It is not a de Polignac number, because 85173813 - 2⁴ = 85173797 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 (85173313) 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 11 ways as a sum of consecutive naturals, for example, 20031 + ... + 23907.

It is an arithmetic number, because the mean of its divisors is an integer number (10259249).

Almost surely, 2^85173813 is an apocalyptic number.

It is an amenable number.

85173813 is a deficient number, since it is larger than the sum of its proper divisors (37937175).

85173813 is a wasteful number, since it uses less digits than its factorization.

85173813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324 (or 6321 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 85173813 is about 9228.9659767495. The cubic root of 85173813 is about 439.9824597002.

The spelling of 85173813 in words is "eighty-five million, one hundred seventy-three thousand, eight hundred thirteen".