85173589 has 2 divisors, whose sum is σ = 85173590. Its totient is φ = 85173588.

The previous prime is 85173563. The next prime is 85173617. The reversal of 85173589 is 98537158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83631025 + 1542564 = 9145^2 + 1242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85173589 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 (85173509) 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 as a sum of consecutive naturals, namely, 42586794 + 42586795.

It is an arithmetic number, because the mean of its divisors is an integer number (42586795).

Almost surely, 2^85173589 is an apocalyptic number.

It is an amenable number.

85173589 is a deficient number, since it is larger than the sum of its proper divisors (1).

85173589 is an equidigital number, since it uses as much as digits as its factorization.

85173589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 85173589 is about 9228.9538410375. The cubic root of 85173589 is about 439.9820739942.

The spelling of 85173589 in words is "eighty-five million, one hundred seventy-three thousand, five hundred eighty-nine".