2019811 has 2 divisors, whose sum is σ = 2019812. Its totient is φ = 2019810.

The previous prime is 2019803. The next prime is 2019817. The reversal of 2019811 is 1189102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2019811 - 2³ = 2019803 is a prime.

It is a Chen prime.

2019811 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2019817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009905 + 1009906.

It is an arithmetic number, because the mean of its divisors is an integer number (1009906).

2^2019811 is an apocalyptic number.

2019811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2019811 is an equidigital number, since it uses as much as digits as its factorization.

2019811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 2019811 is about 1421.2005488319. The cubic root of 2019811 is about 126.4067438519.

The spelling of 2019811 in words is "two million, nineteen thousand, eight hundred eleven".