51685739 has 12 divisors (see below), whose sum is σ = 60294600. Its totient is φ = 44176608.

The previous prime is 51685723. The next prime is 51685741. The reversal of 51685739 is 93758615.

51685739 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 51685739 - 2⁴ = 51685723 is a prime.

It is a super-2 number, since 2×51685739² = 5342831231952242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51685739.

It is not an unprimeable number, because it can be changed into a prime (51685769) 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 11 ways as a sum of consecutive naturals, for example, 18752 + ... + 21330.

It is an arithmetic number, because the mean of its divisors is an integer number (5024550).

Almost surely, 2^51685739 is an apocalyptic number.

51685739 is a deficient number, since it is larger than the sum of its proper divisors (8608861).

51685739 is a wasteful number, since it uses less digits than its factorization.

51685739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002 (or 2995 counting only the distinct ones).

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

The square root of 51685739 is about 7189.2794492911. The cubic root of 51685739 is about 372.4976838737.

The spelling of 51685739 in words is "fifty-one million, six hundred eighty-five thousand, seven hundred thirty-nine".