819494281 has 2 divisors, whose sum is σ = 819494282. Its totient is φ = 819494280.

The previous prime is 819494279. The next prime is 819494323. The reversal of 819494281 is 182494918.

819494281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817045056 + 2449225 = 28584^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 819494281 - 2¹ = 819494279 is a prime.

It is a super-2 number, since 2×819494281² = 1343141753183413922, which contains 22 as substring.

Together with 819494279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (819494261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409747140 + 409747141.

It is an arithmetic number, because the mean of its divisors is an integer number (409747141).

Almost surely, 2^819494281 is an apocalyptic number.

It is an amenable number.

819494281 is a deficient number, since it is larger than the sum of its proper divisors (1).

819494281 is an equidigital number, since it uses as much as digits as its factorization.

819494281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 46.

The square root of 819494281 is about 28626.8105278950. The cubic root of 819494281 is about 935.7977048541.

The spelling of 819494281 in words is "eight hundred nineteen million, four hundred ninety-four thousand, two hundred eighty-one".