86171871197 has 4 divisors (see below), whose sum is σ = 86172985596. Its totient is φ = 86170756800.

The previous prime is 86171871193. The next prime is 86171871199. The reversal of 86171871197 is 79117817168.

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 73165381081 + 13006490116 = 270491^2 + 114046^2 .

It is a cyclic number.

It is not a de Polignac number, because 86171871197 - 2² = 86171871193 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 (86171871193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431804 + ... + 598997.

It is an arithmetic number, because the mean of its divisors is an integer number (21543246399).

Almost surely, 2^86171871197 is an apocalyptic number.

It is an amenable number.

86171871197 is a deficient number, since it is larger than the sum of its proper divisors (1114399).

86171871197 is a wasteful number, since it uses less digits than its factorization.

86171871197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114398.

The product of its digits is 1185408, while the sum is 56.

The spelling of 86171871197 in words is "eighty-six billion, one hundred seventy-one million, eight hundred seventy-one thousand, one hundred ninety-seven".