81103 has 8 divisors (see below), whose sum is σ = 90576. Its totient is φ = 72000.

The previous prime is 81101. The next prime is 81119. The reversal of 81103 is 30118.

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 81103 - 2¹ = 81101 is a prime.

It is a Duffinian number.

81103 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81101) 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, 753 + ... + 853.

It is an arithmetic number, because the mean of its divisors is an integer number (11322).

2⁸¹¹⁰³ is an apocalyptic number.

81103 is a deficient number, since it is larger than the sum of its proper divisors (9473).

81103 is a wasteful number, since it uses less digits than its factorization.

81103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 81103 is about 284.7858844817. The cubic root of 81103 is about 43.2858190578.

It can be divided in two parts, 8 and 1103, that added together give a palindrome (1111).

The spelling of 81103 in words is "eighty-one thousand, one hundred three".