81182 has 4 divisors (see below), whose sum is σ = 121776. Its totient is φ = 40590.

The previous prime is 81181. The next prime is 81197. The reversal of 81182 is 28118.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20294 + ... + 20297.

It is an arithmetic number, because the mean of its divisors is an integer number (30444).

2⁸¹¹⁸² is an apocalyptic number.

81182 is a deficient number, since it is larger than the sum of its proper divisors (40594).

81182 is a wasteful number, since it uses less digits than its factorization.

81182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40593.

The product of its digits is 128, while the sum is 20.

The square root of 81182 is about 284.9245514167. The cubic root of 81182 is about 43.2998689697.

The spelling of 81182 in words is "eighty-one thousand, one hundred eighty-two".