51444561 has 12 divisors (see below), whose sum is σ = 79791792. Its totient is φ = 29396808.

The previous prime is 51444559. The next prime is 51444587. The reversal of 51444561 is 16544415.

51444561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51444561 - 2¹ = 51444559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51444961) 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 11 ways as a sum of consecutive naturals, for example, 174835 + ... + 175128.

It is an arithmetic number, because the mean of its divisors is an integer number (6649316).

Almost surely, 2^51444561 is an apocalyptic number.

It is an amenable number.

51444561 is a deficient number, since it is larger than the sum of its proper divisors (28347231).

51444561 is a wasteful number, since it uses less digits than its factorization.

51444561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349980 (or 349973 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 51444561 is about 7172.4863889728. The cubic root of 51444561 is about 371.9173926297.

Adding to 51444561 its reverse (16544415), we get a palindrome (67988976).

The spelling of 51444561 in words is "fifty-one million, four hundred forty-four thousand, five hundred sixty-one".