81335 has 4 divisors (see below), whose sum is σ = 97608. Its totient is φ = 65064.

The previous prime is 81331. The next prime is 81343. The reversal of 81335 is 53318.

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

It is a cyclic number.

It is not a de Polignac number, because 81335 - 2² = 81331 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81331) 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, 8129 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (24402).

2⁸¹³³⁵ is an apocalyptic number.

81335 is a deficient number, since it is larger than the sum of its proper divisors (16273).

81335 is a wasteful number, since it uses less digits than its factorization.

81335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16272.

The product of its digits is 360, while the sum is 20.

The square root of 81335 is about 285.1929171631. The cubic root of 81335 is about 43.3270536594.

It can be divided in two parts, 813 and 35, that added together give a palindrome (848).

The spelling of 81335 in words is "eighty-one thousand, three hundred thirty-five".