51332321 has 4 divisors (see below), whose sum is σ = 51360000. Its totient is φ = 51304644.

The previous prime is 51332279. The next prime is 51332339. The reversal of 51332321 is 12323315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12323315 = 5 ⋅2464663.

It is a cyclic number.

It is not a de Polignac number, because 51332321 - 2¹⁴ = 51315937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51332293 and 51332302.

It is not an unprimeable number, because it can be changed into a prime (51332381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10841 + ... + 14838.

It is an arithmetic number, because the mean of its divisors is an integer number (12840000).

Almost surely, 2^51332321 is an apocalyptic number.

It is an amenable number.

51332321 is a deficient number, since it is larger than the sum of its proper divisors (27679).

51332321 is a wasteful number, since it uses less digits than its factorization.

51332321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27678.

The product of its digits is 540, while the sum is 20.

The square root of 51332321 is about 7164.6577727062. The cubic root of 51332321 is about 371.6467167620.

Adding to 51332321 its reverse (12323315), we get a palindrome (63655636).

The spelling of 51332321 in words is "fifty-one million, three hundred thirty-two thousand, three hundred twenty-one".