445530721 has 4 divisors (see below), whose sum is σ = 447476500. Its totient is φ = 443584944.

The previous prime is 445530703. The next prime is 445530733. The reversal of 445530721 is 127035544.

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 248409121 + 197121600 = 15761^2 + 14040^2 .

It is a cyclic number.

It is not a de Polignac number, because 445530721 - 2⁵ = 445530689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445590721) 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, 972546 + ... + 973003.

It is an arithmetic number, because the mean of its divisors is an integer number (111869125).

Almost surely, 2^445530721 is an apocalyptic number.

It is an amenable number.

445530721 is a deficient number, since it is larger than the sum of its proper divisors (1945779).

445530721 is a wasteful number, since it uses less digits than its factorization.

445530721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945778.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 445530721 is about 21107.5986554605. The cubic root of 445530721 is about 763.7640606432.

The spelling of 445530721 in words is "four hundred forty-five million, five hundred thirty thousand, seven hundred twenty-one".