51304321 has 4 divisors (see below), whose sum is σ = 51517444. Its totient is φ = 51091200.

The previous prime is 51304291. The next prime is 51304333. The reversal of 51304321 is 12340315.

51304321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30647296 + 20657025 = 5536^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 51304321 - 2⁷ = 51304193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51304381) 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, 106200 + ... + 106681.

It is an arithmetic number, because the mean of its divisors is an integer number (12879361).

Almost surely, 2^51304321 is an apocalyptic number.

It is an amenable number.

51304321 is a deficient number, since it is larger than the sum of its proper divisors (213123).

51304321 is a wasteful number, since it uses less digits than its factorization.

51304321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213122.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51304321 is about 7162.7034700593. The cubic root of 51304321 is about 371.5791310091.

Adding to 51304321 its reverse (12340315), we get a palindrome (63644636).

The spelling of 51304321 in words is "fifty-one million, three hundred four thousand, three hundred twenty-one".