51285305 has 4 divisors (see below), whose sum is σ = 61542372. Its totient is φ = 41028240.

The previous prime is 51285259. The next prime is 51285343. The reversal of 51285305 is 50358215.

51285305 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 24078649 + 27206656 = 4907^2 + 5216^2 .

It is not a de Polignac number, because 51285305 - 2¹⁶ = 51219769 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 5128526 + ... + 5128535.

It is an arithmetic number, because the mean of its divisors is an integer number (15385593).

Almost surely, 2^51285305 is an apocalyptic number.

It is an amenable number.

51285305 is a deficient number, since it is larger than the sum of its proper divisors (10257067).

51285305 is a wasteful number, since it uses less digits than its factorization.

51285305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10257066.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 51285305 is about 7161.3759152833. The cubic root of 51285305 is about 371.5332166053.

The spelling of 51285305 in words is "fifty-one million, two hundred eighty-five thousand, three hundred five".