81545 has 8 divisors (see below), whose sum is σ = 100224. Its totient is φ = 63664.

The previous prime is 81533. The next prime is 81547. The reversal of 81545 is 54518.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81545 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81545.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81545.

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 7 ways as a sum of consecutive naturals, for example, 62 + ... + 408.

It is an arithmetic number, because the mean of its divisors is an integer number (12528).

2⁸¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

81545 is a deficient number, since it is larger than the sum of its proper divisors (18679).

81545 is a wasteful number, since it uses less digits than its factorization.

81545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399.

The product of its digits is 800, while the sum is 23.

The square root of 81545 is about 285.5608516586. The cubic root of 81545 is about 43.3643105263.

It can be divided in two parts, 81 and 545, that added together give a palindrome (626).

The spelling of 81545 in words is "eighty-one thousand, five hundred forty-five".