1818384649 has 2 divisors, whose sum is σ = 1818384650. Its totient is φ = 1818384648.

The previous prime is 1818384629. The next prime is 1818384679. The reversal of 1818384649 is 9464838181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1661133049 + 157251600 = 40757^2 + 12540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818384649 - 2⁹ = 1818384137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1818384596 and 1818384605.

It is not a weakly prime, because it can be changed into another prime (1818384629) 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, 909192324 + 909192325.

It is an arithmetic number, because the mean of its divisors is an integer number (909192325).

Almost surely, 2^1818384649 is an apocalyptic number.

It is an amenable number.

1818384649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818384649 is an equidigital number, since it uses as much as digits as its factorization.

1818384649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 52.

The square root of 1818384649 is about 42642.5216069594. The cubic root of 1818384649 is about 1220.5678287031.

The spelling of 1818384649 in words is "one billion, eight hundred eighteen million, three hundred eighty-four thousand, six hundred forty-nine".