81443083 has 4 divisors (see below), whose sum is σ = 81501120. Its totient is φ = 81385048.

The previous prime is 81443081. The next prime is 81443111. The reversal of 81443083 is 38034418.

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 81443083 - 2¹ = 81443081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81443081) 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, 26860 + ... + 29737.

It is an arithmetic number, because the mean of its divisors is an integer number (20375280).

Almost surely, 2^81443083 is an apocalyptic number.

81443083 is a deficient number, since it is larger than the sum of its proper divisors (58037).

81443083 is a wasteful number, since it uses less digits than its factorization.

81443083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58036.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 81443083 is about 9024.5821509918. The cubic root of 81443083 is about 433.4623705789.

The spelling of 81443083 in words is "eighty-one million, four hundred forty-three thousand, eighty-three".