81546 has 8 divisors (see below), whose sum is σ = 163104. Its totient is φ = 27180.

The previous prime is 81533. The next prime is 81547. The reversal of 81546 is 64518.

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

81546 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81547) 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, 6790 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (20388).

2⁸¹⁵⁴⁶ is an apocalyptic number.

81546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81552).

81546 is a wasteful number, since it uses less digits than its factorization.

81546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13596.

The product of its digits is 960, while the sum is 24.

The square root of 81546 is about 285.5626025935. The cubic root of 81546 is about 43.3644877868.

It can be divided in two parts, 815 and 46, that added together give a triangular number (861 = T₄₁).

The spelling of 81546 in words is "eighty-one thousand, five hundred forty-six".