44721521 has 8 divisors (see below), whose sum is σ = 48704040. Its totient is φ = 40816512.

The previous prime is 44721517. The next prime is 44721527. The reversal of 44721521 is 12512744.

44721521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2002225 + 42719296 = 1415^2 + 6536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 44721521 - 2² = 44721517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (44721527) 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 7 ways as a sum of consecutive naturals, for example, 18170 + ... + 20483.

It is an arithmetic number, because the mean of its divisors is an integer number (6088005).

Almost surely, 2^44721521 is an apocalyptic number.

It is an amenable number.

44721521 is a deficient number, since it is larger than the sum of its proper divisors (3982519).

44721521 is a wasteful number, since it uses less digits than its factorization.

44721521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38755.

The product of its digits is 2240, while the sum is 26.

The square root of 44721521 is about 6687.4151209567. The cubic root of 44721521 is about 354.9540931182.

The spelling of 44721521 in words is "forty-four million, seven hundred twenty-one thousand, five hundred twenty-one".