444002612521 has 4 divisors (see below), whose sum is σ = 478156659652. Its totient is φ = 409848565392.

The previous prime is 444002612519. The next prime is 444002612549. The reversal of 444002612521 is 125216200444.

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 211750906896 + 232251705625 = 460164^2 + 481925^2 .

It is a cyclic number.

It is not a de Polignac number, because 444002612521 - 2¹ = 444002612519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444002712521) 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, 17077023546 + ... + 17077023571.

It is an arithmetic number, because the mean of its divisors is an integer number (119539164913).

Almost surely, 2^444002612521 is an apocalyptic number.

It is an amenable number.

444002612521 is a deficient number, since it is larger than the sum of its proper divisors (34154047131).

444002612521 is a wasteful number, since it uses less digits than its factorization.

444002612521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34154047130.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 444002612521 its reverse (125216200444), we get a palindrome (569218812965).

The spelling of 444002612521 in words is "four hundred forty-four billion, two million, six hundred twelve thousand, five hundred twenty-one".