1818905441 has 2 divisors, whose sum is σ = 1818905442. Its totient is φ = 1818905440.

The previous prime is 1818905423. The next prime is 1818905447. The reversal of 1818905441 is 1445098181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1804465441 + 14440000 = 42479^2 + 3800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818905441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1818905447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909452720 + 909452721.

It is an arithmetic number, because the mean of its divisors is an integer number (909452721).

Almost surely, 2^1818905441 is an apocalyptic number.

It is an amenable number.

1818905441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818905441 is an equidigital number, since it uses as much as digits as its factorization.

1818905441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 1818905441 is about 42648.6276567019. The cubic root of 1818905441 is about 1220.6843426074.

The spelling of 1818905441 in words is "one billion, eight hundred eighteen million, nine hundred five thousand, four hundred forty-one".