81143 has 4 divisors (see below), whose sum is σ = 82728. Its totient is φ = 79560.

The previous prime is 81131. The next prime is 81157. The reversal of 81143 is 34118.

It is a happy number.

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 81143 - 2¹² = 77047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81163) 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, 713 + ... + 818.

It is an arithmetic number, because the mean of its divisors is an integer number (20682).

2⁸¹¹⁴³ is an apocalyptic number.

81143 is a deficient number, since it is larger than the sum of its proper divisors (1585).

81143 is a wasteful number, since it uses less digits than its factorization.

81143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584.

The product of its digits is 96, while the sum is 17.

The square root of 81143 is about 284.8561040245. The cubic root of 81143 is about 43.2929340770.

It can be divided in two parts, 8114 and 3, that multiplied together give a palindrome (24342).

The spelling of 81143 in words is "eighty-one thousand, one hundred forty-three".