449998981 has 2 divisors, whose sum is σ = 449998982. Its totient is φ = 449998980.

The previous prime is 449998949. The next prime is 449999047. The reversal of 449998981 is 189899944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281232900 + 168766081 = 16770^2 + 12991^2 .

It is a cyclic number.

It is not a de Polignac number, because 449998981 - 2⁵ = 449998949 is a prime.

It is a super-2 number, since 2×449998981² = 404998165802076722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (449992981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224999490 + 224999491.

It is an arithmetic number, because the mean of its divisors is an integer number (224999491).

Almost surely, 2^449998981 is an apocalyptic number.

It is an amenable number.

449998981 is a deficient number, since it is larger than the sum of its proper divisors (1).

449998981 is an equidigital number, since it uses as much as digits as its factorization.

449998981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 61.

The square root of 449998981 is about 21213.1794175225. The cubic root of 449998981 is about 766.3088539714.

The spelling of 449998981 in words is "four hundred forty-nine million, nine hundred ninety-eight thousand, nine hundred eighty-one".