1822421186809 has 2 divisors, whose sum is σ = 1822421186810. Its totient is φ = 1822421186808.

The previous prime is 1822421186771. The next prime is 1822421186869. The reversal of 1822421186809 is 9086811242281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1706001699600 + 116419487209 = 1306140^2 + 341203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1822421186809 - 2⁷ = 1822421186681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1822421186869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911210593404 + 911210593405.

It is an arithmetic number, because the mean of its divisors is an integer number (911210593405).

Almost surely, 2^{1822421186809} is an apocalyptic number.

It is an amenable number.

1822421186809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822421186809 is an equidigital number, since it uses as much as digits as its factorization.

1822421186809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 52.

The spelling of 1822421186809 in words is "one trillion, eight hundred twenty-two billion, four hundred twenty-one million, one hundred eighty-six thousand, eight hundred nine".