819802019 has 2 divisors, whose sum is σ = 819802020. Its totient is φ = 819802018.

The previous prime is 819802013. The next prime is 819802091. The reversal of 819802019 is 910208918.

Together with next prime (819802091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819802019 is a prime.

It is a super-2 number, since 2×819802019² = 1344150700712952722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (819802013) 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, 409901009 + 409901010.

It is an arithmetic number, because the mean of its divisors is an integer number (409901010).

Almost surely, 2^819802019 is an apocalyptic number.

819802019 is a deficient number, since it is larger than the sum of its proper divisors (1).

819802019 is an equidigital number, since it uses as much as digits as its factorization.

819802019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 819802019 is about 28632.1850196593. The cubic root of 819802019 is about 935.9148276865.

The spelling of 819802019 in words is "eight hundred nineteen million, eight hundred two thousand, nineteen".