819342779 has 2 divisors, whose sum is σ = 819342780. Its totient is φ = 819342778.

The previous prime is 819342743. The next prime is 819342787. The reversal of 819342779 is 977243918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 819342779 - 2²⁰ = 818294203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (819342709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409671389 + 409671390.

It is an arithmetic number, because the mean of its divisors is an integer number (409671390).

Almost surely, 2^819342779 is an apocalyptic number.

819342779 is a deficient number, since it is larger than the sum of its proper divisors (1).

819342779 is an equidigital number, since it uses as much as digits as its factorization.

819342779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 819342779 is about 28624.1642498082. The cubic root of 819342779 is about 935.7400335297.

The spelling of 819342779 in words is "eight hundred nineteen million, three hundred forty-two thousand, seven hundred seventy-nine".