51315252 has 24 divisors (see below), whose sum is σ = 119855232. Its totient is φ = 17088000.

The previous prime is 51315227. The next prime is 51315281. The reversal of 51315252 is 25251315.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17877 + ... + 20547.

It is an arithmetic number, because the mean of its divisors is an integer number (4993968).

Almost surely, 2^51315252 is an apocalyptic number.

It is an amenable number.

51315252 is an abundant number, since it is smaller than the sum of its proper divisors (68539980).

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

51315252 is a wasteful number, since it uses less digits than its factorization.

51315252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279 (or 4277 counting only the distinct ones).

The product of its digits is 1500, while the sum is 24.

The square root of 51315252 is about 7163.4664792962. The cubic root of 51315252 is about 371.6055189297.

Adding to 51315252 its reverse (25251315), we get a palindrome (76566567).

The spelling of 51315252 in words is "fifty-one million, three hundred fifteen thousand, two hundred fifty-two".