51839321 has 4 divisors (see below), whose sum is σ = 51889152. Its totient is φ = 51789492.

The previous prime is 51839317. The next prime is 51839329. The reversal of 51839321 is 12393815.

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.

It is a cyclic number.

It is not a de Polignac number, because 51839321 - 2² = 51839317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51839329) by changing a digit.

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, 23321 + ... + 25446.

It is an arithmetic number, because the mean of its divisors is an integer number (12972288).

Almost surely, 2^51839321 is an apocalyptic number.

It is an amenable number.

51839321 is a deficient number, since it is larger than the sum of its proper divisors (49831).

51839321 is a wasteful number, since it uses less digits than its factorization.

51839321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49830.

The product of its digits is 6480, while the sum is 32.

The square root of 51839321 is about 7199.9528470678. The cubic root of 51839321 is about 372.8662727669.

The spelling of 51839321 in words is "fifty-one million, eight hundred thirty-nine thousand, three hundred twenty-one".