450021001 has 2 divisors, whose sum is σ = 450021002. Its totient is φ = 450021000.

The previous prime is 450020999. The next prime is 450021037. The reversal of 450021001 is 100120054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443523600 + 6497401 = 21060^2 + 2549^2 .

It is a cyclic number.

It is not a de Polignac number, because 450021001 - 2¹ = 450020999 is a prime.

Together with 450020999, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (450021041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225010500 + 225010501.

It is an arithmetic number, because the mean of its divisors is an integer number (225010501).

Almost surely, 2^450021001 is an apocalyptic number.

It is an amenable number.

450021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

450021001 is an equidigital number, since it uses as much as digits as its factorization.

450021001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 450021001 is about 21213.6984281384. The cubic root of 450021001 is about 766.3213531447.

Adding to 450021001 its reverse (100120054), we get a palindrome (550141055).

The spelling of 450021001 in words is "four hundred fifty million, twenty-one thousand, one".