450545021 has 4 divisors (see below), whose sum is σ = 450599100. Its totient is φ = 450490944.

The previous prime is 450544987. The next prime is 450545027. The reversal of 450545021 is 120545054.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 391485796 + 59059225 = 19786^2 + 7685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-450545021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450545027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11606 + ... + 32183.

It is an arithmetic number, because the mean of its divisors is an integer number (112649775).

Almost surely, 2^450545021 is an apocalyptic number.

It is an amenable number.

450545021 is a deficient number, since it is larger than the sum of its proper divisors (54079).

450545021 is a wasteful number, since it uses less digits than its factorization.

450545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54078.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 450545021 is about 21226.0458164021. The cubic root of 450545021 is about 766.6186814537.

The spelling of 450545021 in words is "four hundred fifty million, five hundred forty-five thousand, twenty-one".