81043143 has 4 divisors (see below), whose sum is σ = 108057528. Its totient is φ = 54028760.

The previous prime is 81043141. The next prime is 81043211. The reversal of 81043143 is 34134018.

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 81043143 - 2¹ = 81043141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81043141) 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, 13507188 + ... + 13507193.

It is an arithmetic number, because the mean of its divisors is an integer number (27014382).

Almost surely, 2^81043143 is an apocalyptic number.

81043143 is a deficient number, since it is larger than the sum of its proper divisors (27014385).

81043143 is a wasteful number, since it uses less digits than its factorization.

81043143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27014384.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81043143 is about 9002.3965142622. The cubic root of 81043143 is about 432.7516759431.

The spelling of 81043143 in words is "eighty-one million, forty-three thousand, one hundred forty-three".