81794443 has 4 divisors (see below), whose sum is σ = 82246528. Its totient is φ = 81342360.

The previous prime is 81794441. The next prime is 81794459. The reversal of 81794443 is 34449718.

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 81794443 - 2¹ = 81794441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81794396 and 81794405.

It is not an unprimeable number, because it can be changed into a prime (81794441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225771 + ... + 226132.

It is an arithmetic number, because the mean of its divisors is an integer number (20561632).

Almost surely, 2^81794443 is an apocalyptic number.

81794443 is a deficient number, since it is larger than the sum of its proper divisors (452085).

81794443 is a wasteful number, since it uses less digits than its factorization.

81794443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452084.

The product of its digits is 96768, while the sum is 40.

The square root of 81794443 is about 9044.0280295895. The cubic root of 81794443 is about 434.0848209986.

The spelling of 81794443 in words is "eighty-one million, seven hundred ninety-four thousand, four hundred forty-three".