51685285 has 4 divisors (see below), whose sum is σ = 62022348. Its totient is φ = 41348224.

The previous prime is 51685273. The next prime is 51685313. The reversal of 51685285 is 58258615.

51685285 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 7834401 + 43850884 = 2799^2 + 6622^2 .

It is a cyclic number.

It is not a de Polignac number, because 51685285 - 2¹⁹ = 51160997 is a prime.

It is a Duffinian number.

It is a congruent 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, 5168524 + ... + 5168533.

It is an arithmetic number, because the mean of its divisors is an integer number (15505587).

Almost surely, 2^51685285 is an apocalyptic number.

It is an amenable number.

51685285 is a deficient number, since it is larger than the sum of its proper divisors (10337063).

51685285 is a wasteful number, since it uses less digits than its factorization.

51685285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10337062.

The product of its digits is 96000, while the sum is 40.

The square root of 51685285 is about 7189.2478744303. The cubic root of 51685285 is about 372.4965932154.

The spelling of 51685285 in words is "fifty-one million, six hundred eighty-five thousand, two hundred eighty-five".