444945221 has 4 divisors (see below), whose sum is σ = 508508832. Its totient is φ = 381381612.

The previous prime is 444945203. The next prime is 444945223. The reversal of 444945221 is 122549444.

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 a de Polignac number, because none of the positive numbers 2^k-444945221 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 (444945223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31781795 + ... + 31781808.

It is an arithmetic number, because the mean of its divisors is an integer number (127127208).

Almost surely, 2^444945221 is an apocalyptic number.

It is an amenable number.

444945221 is a deficient number, since it is larger than the sum of its proper divisors (63563611).

444945221 is an equidigital number, since it uses as much as digits as its factorization.

444945221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63563610.

The product of its digits is 46080, while the sum is 35.

The square root of 444945221 is about 21093.7246829478. The cubic root of 444945221 is about 763.4293438134.

The spelling of 444945221 in words is "four hundred forty-four million, nine hundred forty-five thousand, two hundred twenty-one".