18249000449 has 2 divisors, whose sum is σ = 18249000450. Its totient is φ = 18249000448.

The previous prime is 18249000409. The next prime is 18249000521. The reversal of 18249000449 is 94400094281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9196810000 + 9052190449 = 95900^2 + 95143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18249000449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18249000409) 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, 9124500224 + 9124500225.

It is an arithmetic number, because the mean of its divisors is an integer number (9124500225).

Almost surely, 2^18249000449 is an apocalyptic number.

It is an amenable number.

18249000449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18249000449 is an equidigital number, since it uses as much as digits as its factorization.

18249000449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 18249000449 in words is "eighteen billion, two hundred forty-nine million, four hundred forty-nine", and thus it is an aban number.