86421173 has 4 divisors (see below), whose sum is σ = 86499660. Its totient is φ = 86342688.

The previous prime is 86421163. The next prime is 86421187. The reversal of 86421173 is 37112468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1909924 + 84511249 = 1382^2 + 9193^2 .

It is a cyclic number.

It is not a de Polignac number, because 86421173 - 2¹² = 86417077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86421113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37568 + ... + 39801.

It is an arithmetic number, because the mean of its divisors is an integer number (21624915).

Almost surely, 2^86421173 is an apocalyptic number.

It is an amenable number.

86421173 is a deficient number, since it is larger than the sum of its proper divisors (78487).

86421173 is a wasteful number, since it uses less digits than its factorization.

86421173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78486.

The product of its digits is 8064, while the sum is 32.

The square root of 86421173 is about 9296.2988871916. The cubic root of 86421173 is about 442.1198889239.

The spelling of 86421173 in words is "eighty-six million, four hundred twenty-one thousand, one hundred seventy-three".