51739685 has 4 divisors (see below), whose sum is σ = 62087628. Its totient is φ = 41391744.

The previous prime is 51739657. The next prime is 51739691. The reversal of 51739685 is 58693715.

51739685 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 23020804 + 28718881 = 4798^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 51739685 - 2¹² = 51735589 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, 5173964 + ... + 5173973.

It is an arithmetic number, because the mean of its divisors is an integer number (15521907).

Almost surely, 2^51739685 is an apocalyptic number.

It is an amenable number.

51739685 is a deficient number, since it is larger than the sum of its proper divisors (10347943).

51739685 is a wasteful number, since it uses less digits than its factorization.

51739685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10347942.

The product of its digits is 226800, while the sum is 44.

The square root of 51739685 is about 7193.0303071793. The cubic root of 51739685 is about 372.6272345862.

The spelling of 51739685 in words is "fifty-one million, seven hundred thirty-nine thousand, six hundred eighty-five".