81814 has 8 divisors (see below), whose sum is σ = 129240. Its totient is φ = 38736.

The previous prime is 81799. The next prime is 81817. The reversal of 81814 is 41818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1039 + ... + 1114.

It is an arithmetic number, because the mean of its divisors is an integer number (16155).

2⁸¹⁸¹⁴ is an apocalyptic number.

81814 is a deficient number, since it is larger than the sum of its proper divisors (47426).

81814 is a wasteful number, since it uses less digits than its factorization.

81814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174.

The product of its digits is 256, while the sum is 22.

The square root of 81814 is about 286.0314668004. The cubic root of 81814 is about 43.4119414711.

The spelling of 81814 in words is "eighty-one thousand, eight hundred fourteen".