81355 has 8 divisors (see below), whose sum is σ = 99792. Its totient is φ = 63648.

The previous prime is 81353. The next prime is 81359. The reversal of 81355 is 55318.

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

It is a cyclic number.

It is not a de Polignac number, because 81355 - 2¹ = 81353 is a prime.

It is a Duffinian number.

81355 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (81353) 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 7 ways as a sum of consecutive naturals, for example, 112 + ... + 418.

It is an arithmetic number, because the mean of its divisors is an integer number (12474).

2⁸¹³⁵⁵ is an apocalyptic number.

81355 is a deficient number, since it is larger than the sum of its proper divisors (18437).

81355 is a wasteful number, since it uses less digits than its factorization.

81355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365.

The product of its digits is 600, while the sum is 22.

The square root of 81355 is about 285.2279789922. The cubic root of 81355 is about 43.3306046934.

It can be divided in two parts, 813 and 55, that added together give a palindrome (868).

The spelling of 81355 in words is "eighty-one thousand, three hundred fifty-five".