1811219 has 2 divisors, whose sum is σ = 1811220. Its totient is φ = 1811218.

The previous prime is 1811209. The next prime is 1811287. The reversal of 1811219 is 9121181.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1811219 is a prime.

It is a super-2 number, since 2×1811219² = 6561028531922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1811194 and 1811203.

It is not a weakly prime, because it can be changed into another prime (1811209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905609 + 905610.

It is an arithmetic number, because the mean of its divisors is an integer number (905610).

2^1811219 is an apocalyptic number.

1811219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811219 is an equidigital number, since it uses as much as digits as its factorization.

1811219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 23.

The square root of 1811219 is about 1345.8153662371. The cubic root of 1811219 is about 121.8962434151.

The spelling of 1811219 in words is "one million, eight hundred eleven thousand, two hundred nineteen".