1818616441 has 2 divisors, whose sum is σ = 1818616442. Its totient is φ = 1818616440.

The previous prime is 1818616427. The next prime is 1818616453. The reversal of 1818616441 is 1446168181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1815100816 + 3515625 = 42604^2 + 1875^2 .

It is an emirp because it is prime and its reverse (1446168181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1818616441 - 2⁵ = 1818616409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1818616394 and 1818616403.

It is not a weakly prime, because it can be changed into another prime (1818616411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909308220 + 909308221.

It is an arithmetic number, because the mean of its divisors is an integer number (909308221).

Almost surely, 2^1818616441 is an apocalyptic number.

It is an amenable number.

1818616441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818616441 is an equidigital number, since it uses as much as digits as its factorization.

1818616441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 40.

The square root of 1818616441 is about 42645.2393708841. The cubic root of 1818616441 is about 1220.6196889880.

The spelling of 1818616441 in words is "one billion, eight hundred eighteen million, six hundred sixteen thousand, four hundred forty-one".