87191 has 8 divisors (see below), whose sum is σ = 99120. Its totient is φ = 76032.

The previous prime is 87187. The next prime is 87211. The reversal of 87191 is 19178.

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 87191 - 2² = 87187 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 87191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87121) 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, 71 + ... + 423.

It is an arithmetic number, because the mean of its divisors is an integer number (12390).

2⁸⁷¹⁹¹ is an apocalyptic number.

87191 is a deficient number, since it is larger than the sum of its proper divisors (11929).

87191 is a wasteful number, since it uses less digits than its factorization.

87191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its digits is 504, while the sum is 26.

The square root of 87191 is about 295.2812218886. The cubic root of 87191 is about 44.3428789566.

The spelling of 87191 in words is "eighty-seven thousand, one hundred ninety-one".