1800816449 has 2 divisors, whose sum is σ = 1800816450. Its totient is φ = 1800816448.

The previous prime is 1800816431. The next prime is 1800816463. The reversal of 1800816449 is 9446180081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1725820849 + 74995600 = 41543^2 + 8660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800816449 - 2¹² = 1800812353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1800816469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900408224 + 900408225.

It is an arithmetic number, because the mean of its divisors is an integer number (900408225).

Almost surely, 2^1800816449 is an apocalyptic number.

It is an amenable number.

1800816449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800816449 is an equidigital number, since it uses as much as digits as its factorization.

1800816449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1800816449 is about 42436.0277240931. The cubic root of 1800816449 is about 1216.6242901193.

The spelling of 1800816449 in words is "one billion, eight hundred million, eight hundred sixteen thousand, four hundred forty-nine".