91143 has 24 divisors (see below), whose sum is σ = 152880. Its totient is φ = 51840.
The previous prime is 91141. The next prime is 91151. The reversal of 91143 is 34119.
It is not a de Polignac number, because 91143 - 21 = 91141 is a prime.
91143 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (91141) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2203 + ... + 2243.
It is an arithmetic number, because the mean of its divisors is an integer number (6370).
291143 is an apocalyptic number.
91143 is a deficient number, since it is larger than the sum of its proper divisors (61737).
91143 is a wasteful number, since it uses less digits than its factorization.
91143 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 79 (or 76 counting only the distinct ones).
The product of its digits is 108, while the sum is 18.
The square root of 91143 is about 301.8989897300. The cubic root of 91143 is about 45.0029627679.
Subtracting from 91143 its sum of digits (18), we obtain a cube (91125 = 453).
The spelling of 91143 in words is "ninety-one thousand, one hundred forty-three".
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