51321316 has 12 divisors (see below), whose sum is σ = 90822060. Its totient is φ = 25372160.

The previous prime is 51321311. The next prime is 51321343. The reversal of 51321316 is 61312315.

It is a happy number.

51321316 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 14062500 + 37258816 = 3750^2 + 6104^2 .

It is not an unprimeable number, because it can be changed into a prime (51321311) 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 3 ways as a sum of consecutive naturals, for example, 71725 + ... + 72436.

It is an arithmetic number, because the mean of its divisors is an integer number (7568505).

Almost surely, 2^51321316 is an apocalyptic number.

It is an amenable number.

51321316 is a deficient number, since it is larger than the sum of its proper divisors (39500744).

51321316 is a wasteful number, since it uses less digits than its factorization.

51321316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144254 (or 144252 counting only the distinct ones).

The product of its digits is 540, while the sum is 22.

The square root of 51321316 is about 7163.8897255611. The cubic root of 51321316 is about 371.6201560796.

Subtracting 51321316 from its reverse (61312315), we obtain a palindrome (9990999).

The spelling of 51321316 in words is "fifty-one million, three hundred twenty-one thousand, three hundred sixteen".