51216252 has 12 divisors (see below), whose sum is σ = 119504616. Its totient is φ = 17072080.

The previous prime is 51216227. The next prime is 51216283. The reversal of 51216252 is 25261215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133999 + ... + 2134022.

It is an arithmetic number, because the mean of its divisors is an integer number (9958718).

Almost surely, 2^51216252 is an apocalyptic number.

It is an amenable number.

51216252 is an abundant number, since it is smaller than the sum of its proper divisors (68288364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51216252 is a wasteful number, since it uses less digits than its factorization.

51216252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268028 (or 4268026 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 51216252 is about 7156.5530809182. The cubic root of 51216252 is about 371.3663916482.

Adding to 51216252 its reverse (25261215), we get a palindrome (76477467).

The spelling of 51216252 in words is "fifty-one million, two hundred sixteen thousand, two hundred fifty-two".