87171197 has 4 divisors (see below), whose sum is σ = 87300636. Its totient is φ = 87041760.

The previous prime is 87171179. The next prime is 87171233. The reversal of 87171197 is 79117178.

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 84842521 + 2328676 = 9211^2 + 1526^2 .

It is a cyclic number.

It is not a de Polignac number, because 87171197 - 2¹⁴ = 87154813 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 (87171157) 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, 63704 + ... + 65057.

It is an arithmetic number, because the mean of its divisors is an integer number (21825159).

Almost surely, 2^87171197 is an apocalyptic number.

It is an amenable number.

87171197 is a deficient number, since it is larger than the sum of its proper divisors (129439).

87171197 is a wasteful number, since it uses less digits than its factorization.

87171197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129438.

The product of its digits is 24696, while the sum is 41.

The square root of 87171197 is about 9336.5516653634. The cubic root of 87171197 is about 443.3952162032.

The spelling of 87171197 in words is "eighty-seven million, one hundred seventy-one thousand, one hundred ninety-seven".