448401009781 has 2 divisors, whose sum is σ = 448401009782. Its totient is φ = 448401009780.

The previous prime is 448401009767. The next prime is 448401009821. The reversal of 448401009781 is 187900104844.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379898416881 + 68502592900 = 616359^2 + 261730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-448401009781 is a prime.

It is a super-2 number, since 2×448401009781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (448401009181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224200504890 + 224200504891.

It is an arithmetic number, because the mean of its divisors is an integer number (224200504891).

Almost surely, 2^448401009781 is an apocalyptic number.

It is an amenable number.

448401009781 is a deficient number, since it is larger than the sum of its proper divisors (1).

448401009781 is an equidigital number, since it uses as much as digits as its factorization.

448401009781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 448401009781 in words is "four hundred forty-eight billion, four hundred one million, nine thousand, seven hundred eighty-one".