450229721 has 4 divisors (see below), whose sum is σ = 451832244. Its totient is φ = 448627200.

The previous prime is 450229699. The next prime is 450229723. The reversal of 450229721 is 127922054.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382398025 + 67831696 = 19555^2 + 8236^2 .

It is a cyclic number.

It is not a de Polignac number, because 450229721 - 2²² = 446035417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (450229723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800840 + ... + 801401.

It is an arithmetic number, because the mean of its divisors is an integer number (112958061).

Almost surely, 2^450229721 is an apocalyptic number.

It is an amenable number.

450229721 is a deficient number, since it is larger than the sum of its proper divisors (1602523).

450229721 is a wasteful number, since it uses less digits than its factorization.

450229721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602522.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 450229721 is about 21218.6173206456. The cubic root of 450229721 is about 766.4398082620.

The spelling of 450229721 in words is "four hundred fifty million, two hundred twenty-nine thousand, seven hundred twenty-one".