51213252 has 24 divisors (see below), whose sum is σ = 119883456. Its totient is φ = 17015968.

The previous prime is 51213233. The next prime is 51213257. The reversal of 51213252 is 25231215.

51213252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51213257) 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, 2928 + ... + 10535.

It is an arithmetic number, because the mean of its divisors is an integer number (4995144).

Almost surely, 2^51213252 is an apocalyptic number.

It is an amenable number.

51213252 is an abundant number, since it is smaller than the sum of its proper divisors (68670204).

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

51213252 is a wasteful number, since it uses less digits than its factorization.

51213252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13787 (or 13785 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 51213252 is about 7156.3434797388. The cubic root of 51213252 is about 371.3591405584.

Adding to 51213252 its reverse (25231215), we get a palindrome (76444467).

The spelling of 51213252 in words is "fifty-one million, two hundred thirteen thousand, two hundred fifty-two".