81194328989243 has 16 divisors (see below), whose sum is σ = 81568251305376. Its totient is φ = 80821353173760.

The previous prime is 81194328989231. The next prime is 81194328989261. The reversal of 81194328989243 is 34298982349118.

It is a cyclic number.

It is not a de Polignac number, because 81194328989243 - 2⁸ = 81194328988987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81194328919243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554847521 + ... + 554993837.

It is an arithmetic number, because the mean of its divisors is an integer number (5098015706586).

Almost surely, 2^{81194328989243} is an apocalyptic number.

81194328989243 is a deficient number, since it is larger than the sum of its proper divisors (373922316133).

81194328989243 is a wasteful number, since it uses less digits than its factorization.

81194328989243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149534.

The product of its digits is 214990848, while the sum is 71.

The spelling of 81194328989243 in words is "eighty-one trillion, one hundred ninety-four billion, three hundred twenty-eight million, nine hundred eighty-nine thousand, two hundred forty-three".