450540421 has 2 divisors, whose sum is σ = 450540422. Its totient is φ = 450540420.

The previous prime is 450540373. The next prime is 450540427. The reversal of 450540421 is 124045054.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426422500 + 24117921 = 20650^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 450540421 - 2¹⁵ = 450507653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450540427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225270210 + 225270211.

It is an arithmetic number, because the mean of its divisors is an integer number (225270211).

Almost surely, 2^450540421 is an apocalyptic number.

It is an amenable number.

450540421 is a deficient number, since it is larger than the sum of its proper divisors (1).

450540421 is an equidigital number, since it uses as much as digits as its factorization.

450540421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 450540421 is about 21225.9374586848. The cubic root of 450540421 is about 766.6160724226.

Adding to 450540421 its reverse (124045054), we get a palindrome (574585475).

The spelling of 450540421 in words is "four hundred fifty million, five hundred forty thousand, four hundred twenty-one".