51315532 has 12 divisors (see below), whose sum is σ = 89860680. Its totient is φ = 25641056.

The previous prime is 51315521. The next prime is 51315547. The reversal of 51315532 is 23551315.

It is a junction number, because it is equal to n+sod(n) for n = 51315497 and 51315506.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4944 + ... + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (7488390).

Almost surely, 2^51315532 is an apocalyptic number.

It is an amenable number.

51315532 is a deficient number, since it is larger than the sum of its proper divisors (38545148).

51315532 is a wasteful number, since it uses less digits than its factorization.

51315532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8360 (or 8358 counting only the distinct ones).

The product of its digits is 2250, while the sum is 25.

The square root of 51315532 is about 7163.4860228802. The cubic root of 51315532 is about 371.6061948129.

Adding to 51315532 its reverse (23551315), we get a palindrome (74866847).

The spelling of 51315532 in words is "fifty-one million, three hundred fifteen thousand, five hundred thirty-two".