444445561 has 16 divisors (see below), whose sum is σ = 530893440. Its totient is φ = 364008960.

The previous prime is 444445559. The next prime is 444445571. The reversal of 444445561 is 165544444.

It is a happy number.

It is not a de Polignac number, because 444445561 - 2¹ = 444445559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 444445561.

It is not an unprimeable number, because it can be changed into a prime (444445531) 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 15 ways as a sum of consecutive naturals, for example, 8406 + ... + 30976.

It is an arithmetic number, because the mean of its divisors is an integer number (33180840).

Almost surely, 2^444445561 is an apocalyptic number.

It is an amenable number.

444445561 is a deficient number, since it is larger than the sum of its proper divisors (86447879).

444445561 is a wasteful number, since it uses less digits than its factorization.

444445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22704.

The product of its digits is 153600, while the sum is 37.

The square root of 444445561 is about 21081.8775492127. The cubic root of 444445561 is about 763.1434674369.

It can be divided in two parts, 44444 and 5561, that added together give a palindrome (50005).

The spelling of 444445561 in words is "four hundred forty-four million, four hundred forty-five thousand, five hundred sixty-one".