91187 has 4 divisors (see below), whose sum is σ = 92616. Its totient is φ = 89760.

The previous prime is 91183. The next prime is 91193. The reversal of 91187 is 78119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78119 = 191 ⋅409.

It is a cyclic number.

It is not a de Polignac number, because 91187 - 2² = 91183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91183) 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, 614 + ... + 747.

It is an arithmetic number, because the mean of its divisors is an integer number (23154).

2⁹¹¹⁸⁷ is an apocalyptic number.

91187 is a deficient number, since it is larger than the sum of its proper divisors (1429).

91187 is a wasteful number, since it uses less digits than its factorization.

91187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428.

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

The square root of 91187 is about 301.9718529930. The cubic root of 91187 is about 45.0102034476.

The spelling of 91187 in words is "ninety-one thousand, one hundred eighty-seven".