87194189 has 8 divisors (see below), whose sum is σ = 88131768. Its totient is φ = 86261760.

The previous prime is 87194183. The next prime is 87194203. The reversal of 87194189 is 98149178.

It can be written as a sum of positive squares in 4 ways, for example, as 34515625 + 52678564 = 5875^2 + 7258^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87194189 - 2⁸ = 87193933 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 (87194183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39269 + ... + 41429.

It is an arithmetic number, because the mean of its divisors is an integer number (11016471).

Almost surely, 2^87194189 is an apocalyptic number.

It is an amenable number.

87194189 is a deficient number, since it is larger than the sum of its proper divisors (937579).

87194189 is a wasteful number, since it uses less digits than its factorization.

87194189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575.

The product of its digits is 145152, while the sum is 47.

The square root of 87194189 is about 9337.7828738946. The cubic root of 87194189 is about 443.4341956177.

The spelling of 87194189 in words is "eighty-seven million, one hundred ninety-four thousand, one hundred eighty-nine".