86172443173 has 2 divisors, whose sum is σ = 86172443174. Its totient is φ = 86172443172.

The previous prime is 86172443141. The next prime is 86172443237. The reversal of 86172443173 is 37134427168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75628850049 + 10543593124 = 275007^2 + 102682^2 .

It is a cyclic number.

It is not a de Polignac number, because 86172443173 - 2⁵ = 86172443141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86172447173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43086221586 + 43086221587.

It is an arithmetic number, because the mean of its divisors is an integer number (43086221587).

Almost surely, 2^86172443173 is an apocalyptic number.

It is an amenable number.

86172443173 is a deficient number, since it is larger than the sum of its proper divisors (1).

86172443173 is an equidigital number, since it uses as much as digits as its factorization.

86172443173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 46.

The spelling of 86172443173 in words is "eighty-six billion, one hundred seventy-two million, four hundred forty-three thousand, one hundred seventy-three".