1800549899 has 2 divisors, whose sum is σ = 1800549900. Its totient is φ = 1800549898.

The previous prime is 1800549889. The next prime is 1800549913. The reversal of 1800549899 is 9989450081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1800549899 - 2⁸ = 1800549643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1800549899.

It is not a weakly prime, because it can be changed into another prime (1800549869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900274949 + 900274950.

It is an arithmetic number, because the mean of its divisors is an integer number (900274950).

Almost surely, 2^1800549899 is an apocalyptic number.

1800549899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800549899 is an equidigital number, since it uses as much as digits as its factorization.

1800549899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 1800549899 is about 42432.8869981763. The cubic root of 1800549899 is about 1216.5642604577.

The spelling of 1800549899 in words is "one billion, eight hundred million, five hundred forty-nine thousand, eight hundred ninety-nine".