81385083 has 12 divisors (see below), whose sum is σ = 126599200. Its totient is φ = 50083056.

The previous prime is 81385081. The next prime is 81385091. The reversal of 81385083 is 38058318.

It is a happy number.

It is not a de Polignac number, because 81385083 - 2¹ = 81385081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81385081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347683 + ... + 347916.

Almost surely, 2^81385083 is an apocalyptic number.

81385083 is a deficient number, since it is larger than the sum of its proper divisors (45214117).

81385083 is a wasteful number, since it uses less digits than its factorization.

81385083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695618 (or 695615 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 81385083 is about 9021.3681334928. The cubic root of 81385083 is about 433.3594488534.

The spelling of 81385083 in words is "eighty-one million, three hundred eighty-five thousand, eighty-three".