450073621 has 2 divisors, whose sum is σ = 450073622. Its totient is φ = 450073620.

The previous prime is 450073619. The next prime is 450073643. The reversal of 450073621 is 126370054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433222596 + 16851025 = 20814^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 450073621 - 2¹ = 450073619 is a prime.

Together with 450073619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 450073621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450073601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225036810 + 225036811.

It is an arithmetic number, because the mean of its divisors is an integer number (225036811).

Almost surely, 2^450073621 is an apocalyptic number.

It is an amenable number.

450073621 is a deficient number, since it is larger than the sum of its proper divisors (1).

450073621 is an equidigital number, since it uses as much as digits as its factorization.

450073621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 450073621 is about 21214.9386282402. The cubic root of 450073621 is about 766.3512200901.

The spelling of 450073621 in words is "four hundred fifty million, seventy-three thousand, six hundred twenty-one".