51321320 has 32 divisors (see below), whose sum is σ = 115792200. Its totient is φ = 20471808.

The previous prime is 51321311. The next prime is 51321343. The reversal of 51321320 is 2312315.

51321320 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 4 ways, for example, as 50098084 + 1223236 = 7078^2 + 1106^2 .

It is an unprimeable number.

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, 14792 + ... + 17928.

Almost surely, 2^51321320 is an apocalyptic number.

It is an amenable number.

51321320 is an abundant number, since it is smaller than the sum of its proper divisors (64470880).

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

51321320 is a wasteful number, since it uses less digits than its factorization.

51321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 51321320 is about 7163.8900047390. The cubic root of 51321320 is about 371.6201657343.

Adding to 51321320 its reverse (2312315), we get a palindrome (53633635).

The spelling of 51321320 in words is "fifty-one million, three hundred twenty-one thousand, three hundred twenty".