91287 has 30 divisors (see below), whose sum is σ = 165528. Its totient is φ = 49896.

The previous prime is 91283. The next prime is 91291. The reversal of 91287 is 78219.

It is an interprime number because it is at equal distance from previous prime (91283) and next prime (91291).

It is not a de Polignac number, because 91287 - 2² = 91283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 91287.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91287.

It is not an unprimeable number, because it can be changed into a prime (91283) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3958 + ... + 3980.

2⁹¹²⁸⁷ is an apocalyptic number.

91287 is a deficient number, since it is larger than the sum of its proper divisors (74241).

91287 is a wasteful number, since it uses less digits than its factorization.

91287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49 (or 33 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 91287 is about 302.1373859687. The cubic root of 91287 is about 45.0266508798.

It can be divided in two parts, 912 and 87, that added together give a palindrome (999).

The spelling of 91287 in words is "ninety-one thousand, two hundred eighty-seven".