819493019 has 2 divisors, whose sum is σ = 819493020. Its totient is φ = 819493018.

The previous prime is 819492941. The next prime is 819493021. The reversal of 819493019 is 910394918.

819493019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819493019 is a prime.

It is a super-2 number, since 2×819493019² = 1343137616379468722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 819493021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (819493039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409746509 + 409746510.

It is an arithmetic number, because the mean of its divisors is an integer number (409746510).

Almost surely, 2^819493019 is an apocalyptic number.

819493019 is a deficient number, since it is larger than the sum of its proper divisors (1).

819493019 is an equidigital number, since it uses as much as digits as its factorization.

819493019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 819493019 is about 28626.7884856126. The cubic root of 819493019 is about 935.7972244858.

The spelling of 819493019 in words is "eight hundred nineteen million, four hundred ninety-three thousand, nineteen".