51521144 has 8 divisors (see below), whose sum is σ = 96602160. Its totient is φ = 25760568.

The previous prime is 51521117. The next prime is 51521147. The reversal of 51521144 is 44112515.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220064 + ... + 3220079.

It is an arithmetic number, because the mean of its divisors is an integer number (12075270).

Almost surely, 2^51521144 is an apocalyptic number.

It is an amenable number.

51521144 is a deficient number, since it is larger than the sum of its proper divisors (45081016).

51521144 is a wasteful number, since it uses less digits than its factorization.

51521144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440149 (or 6440145 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 51521144 is about 7177.8230683126. The cubic root of 51521144 is about 372.1018528673.

Adding to 51521144 its reverse (44112515), we get a palindrome (95633659).

The spelling of 51521144 in words is "fifty-one million, five hundred twenty-one thousand, one hundred forty-four".