51086321 has 24 divisors (see below), whose sum is σ = 61848192. Its totient is φ = 41896800.

The previous prime is 51086293. The next prime is 51086323. The reversal of 51086321 is 12368015.

51086321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51086321 - 2⁶ = 51086257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51086323) 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 23 ways as a sum of consecutive naturals, for example, 73586 + ... + 74276.

It is an arithmetic number, because the mean of its divisors is an integer number (2577008).

Almost surely, 2^51086321 is an apocalyptic number.

It is an amenable number.

51086321 is a deficient number, since it is larger than the sum of its proper divisors (10761871).

51086321 is a wasteful number, since it uses less digits than its factorization.

51086321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51086321 is about 7147.4695522262. The cubic root of 51086321 is about 371.0520847240.

The spelling of 51086321 in words is "fifty-one million, eighty-six thousand, three hundred twenty-one".