819027081 has 12 divisors (see below), whose sum is σ = 1190576452. Its totient is φ = 542539296.

The previous prime is 819027067. The next prime is 819027089. The reversal of 819027081 is 180720918.

It can be written as a sum of positive squares in 2 ways, for example, as 173054025 + 645973056 = 13155^2 + 25416^2 .

It is not a de Polignac number, because 819027081 - 2⁶ = 819027017 is a prime.

It is a super-2 number, since 2×819027081² = 1341610718822761122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819027089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288406 + ... + 291231.

Almost surely, 2^819027081 is an apocalyptic number.

It is an amenable number.

819027081 is a deficient number, since it is larger than the sum of its proper divisors (371549371).

819027081 is a wasteful number, since it uses less digits than its factorization.

819027081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579800 (or 579797 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 819027081 is about 28618.6491819583. The cubic root of 819027081 is about 935.6198358892.

Adding to 819027081 its reverse (180720918), we get a palindrome (999747999).

The spelling of 819027081 in words is "eight hundred nineteen million, twenty-seven thousand, eighty-one".