820017019 has 2 divisors, whose sum is σ = 820017020. Its totient is φ = 820017018.

The previous prime is 820017013. The next prime is 820017043. The reversal of 820017019 is 910710028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820017019 - 2¹¹ = 820014971 is a prime.

It is a super-2 number, since 2×820017019² = 1344855822899292722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (820017013) 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, 410008509 + 410008510.

It is an arithmetic number, because the mean of its divisors is an integer number (410008510).

Almost surely, 2^820017019 is an apocalyptic number.

820017019 is a deficient number, since it is larger than the sum of its proper divisors (1).

820017019 is an equidigital number, since it uses as much as digits as its factorization.

820017019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 820017019 is about 28635.9392896409. The cubic root of 820017019 is about 935.9966377232.

The spelling of 820017019 in words is "eight hundred twenty million, seventeen thousand, nineteen".