1219811 has 2 divisors, whose sum is σ = 1219812. Its totient is φ = 1219810.

The previous prime is 1219807. The next prime is 1219831. The reversal of 1219811 is 1189121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1189121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1219811 - 2² = 1219807 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1219831) 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, 609905 + 609906.

It is an arithmetic number, because the mean of its divisors is an integer number (609906).

2^1219811 is an apocalyptic number.

1219811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219811 is an equidigital number, since it uses as much as digits as its factorization.

1219811 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 1219811 is about 1104.4505421249. The cubic root of 1219811 is about 106.8474549125.

It can be divided in two parts, 12 and 19811, that multiplied together give a palindrome (237732).

The spelling of 1219811 in words is "one million, two hundred nineteen thousand, eight hundred eleven".