449549981 has 2 divisors, whose sum is σ = 449549982. Its totient is φ = 449549980.

The previous prime is 449549959. The next prime is 449550011. The reversal of 449549981 is 189945944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445589881 + 3960100 = 21109^2 + 1990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-449549981 is a prime.

It is a super-2 number, since 2×449549981² = 404190370834200722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (449549911) 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, 224774990 + 224774991.

It is an arithmetic number, because the mean of its divisors is an integer number (224774991).

Almost surely, 2^449549981 is an apocalyptic number.

It is an amenable number.

449549981 is a deficient number, since it is larger than the sum of its proper divisors (1).

449549981 is an equidigital number, since it uses as much as digits as its factorization.

449549981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The square root of 449549981 is about 21202.5937328432. The cubic root of 449549981 is about 766.0538999310.

The spelling of 449549981 in words is "four hundred forty-nine million, five hundred forty-nine thousand, nine hundred eighty-one".