1805228489 has 2 divisors, whose sum is σ = 1805228490. Its totient is φ = 1805228488.

The previous prime is 1805228473. The next prime is 1805228497. The reversal of 1805228489 is 9848225081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 905528464 + 899700025 = 30092^2 + 29995^2 .

It is an emirp because it is prime and its reverse (9848225081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1805228489 - 2⁴ = 1805228473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1805221489) 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, 902614244 + 902614245.

It is an arithmetic number, because the mean of its divisors is an integer number (902614245).

Almost surely, 2^1805228489 is an apocalyptic number.

It is an amenable number.

1805228489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1805228489 is an equidigital number, since it uses as much as digits as its factorization.

1805228489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 47.

The square root of 1805228489 is about 42487.9805239082. The cubic root of 1805228489 is about 1217.6170652305.

The spelling of 1805228489 in words is "one billion, eight hundred five million, two hundred twenty-eight thousand, four hundred eighty-nine".