445223521 has 4 divisors (see below), whose sum is σ = 445599792. Its totient is φ = 444847252.

The previous prime is 445223507. The next prime is 445223531. The reversal of 445223521 is 125322544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 445223521 - 2⁷ = 445223393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 445223521.

It is not an unprimeable number, because it can be changed into a prime (445223531) 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, 186355 + ... + 188728.

It is an arithmetic number, because the mean of its divisors is an integer number (111399948).

Almost surely, 2^445223521 is an apocalyptic number.

It is an amenable number.

445223521 is a deficient number, since it is larger than the sum of its proper divisors (376271).

445223521 is a wasteful number, since it uses less digits than its factorization.

445223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376270.

The product of its digits is 9600, while the sum is 28.

The square root of 445223521 is about 21100.3204004110. The cubic root of 445223521 is about 763.5884780884.

The spelling of 445223521 in words is "four hundred forty-five million, two hundred twenty-three thousand, five hundred twenty-one".