450559981 has 2 divisors, whose sum is σ = 450559982. Its totient is φ = 450559980.

The previous prime is 450559961. The next prime is 450560017. The reversal of 450559981 is 189955054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395651881 + 54908100 = 19891^2 + 7410^2 .

It is a cyclic number.

It is not a de Polignac number, because 450559981 - 2⁷ = 450559853 is a prime.

It is a super-2 number, since 2×450559981² = 406008592957440722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450559951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225279990 + 225279991.

It is an arithmetic number, because the mean of its divisors is an integer number (225279991).

Almost surely, 2^450559981 is an apocalyptic number.

It is an amenable number.

450559981 is a deficient number, since it is larger than the sum of its proper divisors (1).

450559981 is an equidigital number, since it uses as much as digits as its factorization.

450559981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 46.

The square root of 450559981 is about 21226.3982107187. The cubic root of 450559981 is about 766.6271663539.

The spelling of 450559981 in words is "four hundred fifty million, five hundred fifty-nine thousand, nine hundred eighty-one".