85806173 has 2 divisors, whose sum is σ = 85806174. Its totient is φ = 85806172.

The previous prime is 85806167. The next prime is 85806221. The reversal of 85806173 is 37160858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 21132409 = 8042^2 + 4597^2 .

It is a cyclic number.

It is not a de Polignac number, because 85806173 - 2¹⁴ = 85789789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85806143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42903086 + 42903087.

It is an arithmetic number, because the mean of its divisors is an integer number (42903087).

Almost surely, 2^85806173 is an apocalyptic number.

It is an amenable number.

85806173 is a deficient number, since it is larger than the sum of its proper divisors (1).

85806173 is an equidigital number, since it uses as much as digits as its factorization.

85806173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 85806173 is about 9263.1621490720. The cubic root of 85806173 is about 441.0686369825.

The spelling of 85806173 in words is "eighty-five million, eight hundred six thousand, one hundred seventy-three".