85866173 has 2 divisors, whose sum is σ = 85866174. Its totient is φ = 85866172.

The previous prime is 85866169. The next prime is 85866197. The reversal of 85866173 is 37166858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73908409 + 11957764 = 8597^2 + 3458^2 .

It is a cyclic number.

It is not a de Polignac number, because 85866173 - 2² = 85866169 is a prime.

It is a super-4 number, since 4×85866173⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85866103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42933086 + 42933087.

It is an arithmetic number, because the mean of its divisors is an integer number (42933087).

Almost surely, 2^85866173 is an apocalyptic number.

It is an amenable number.

85866173 is a deficient number, since it is larger than the sum of its proper divisors (1).

85866173 is an equidigital number, since it uses as much as digits as its factorization.

85866173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 85866173 is about 9266.4002179919. The cubic root of 85866173 is about 441.1714188351.

The spelling of 85866173 in words is "eighty-five million, eight hundred sixty-six thousand, one hundred seventy-three".