81032443 has 4 divisors (see below), whose sum is σ = 81057328. Its totient is φ = 81007560.

The previous prime is 81032431. The next prime is 81032447. The reversal of 81032443 is 34423018.

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 81032443 - 2⁹ = 81031931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81032447) 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, 6663 + ... + 14368.

It is an arithmetic number, because the mean of its divisors is an integer number (20264332).

Almost surely, 2^81032443 is an apocalyptic number.

81032443 is a deficient number, since it is larger than the sum of its proper divisors (24885).

81032443 is a wasteful number, since it uses less digits than its factorization.

81032443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24884.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81032443 is about 9001.8022084469. The cubic root of 81032443 is about 432.7326299282.

The spelling of 81032443 in words is "eighty-one million, thirty-two thousand, four hundred forty-three".