819394081 has 8 divisors (see below), whose sum is σ = 894975264. Its totient is φ = 743994720.

The previous prime is 819394063. The next prime is 819394097. The reversal of 819394081 is 180493918.

819394081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 819394081 - 2⁵ = 819394049 is a prime.

It is a super-2 number, since 2×819394081² = 1342813319955669122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819394181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35940 + ... + 54133.

It is an arithmetic number, because the mean of its divisors is an integer number (111871908).

Almost surely, 2^819394081 is an apocalyptic number.

It is an amenable number.

819394081 is a deficient number, since it is larger than the sum of its proper divisors (75581183).

819394081 is a wasteful number, since it uses less digits than its factorization.

819394081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90911.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 819394081 is about 28625.0603667486. The cubic root of 819394081 is about 935.7595631391.

The spelling of 819394081 in words is "eight hundred nineteen million, three hundred ninety-four thousand, eighty-one".