51147685 has 4 divisors (see below), whose sum is σ = 61377228. Its totient is φ = 40918144.

The previous prime is 51147661. The next prime is 51147697. The reversal of 51147685 is 58674115.

51147685 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 16467364 + 34680321 = 4058^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 51147685 - 2⁷ = 51147557 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, 5114764 + ... + 5114773.

It is an arithmetic number, because the mean of its divisors is an integer number (15344307).

Almost surely, 2^51147685 is an apocalyptic number.

It is an amenable number.

51147685 is a deficient number, since it is larger than the sum of its proper divisors (10229543).

51147685 is a wasteful number, since it uses less digits than its factorization.

51147685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10229542.

The product of its digits is 33600, while the sum is 37.

The square root of 51147685 is about 7151.7609719565. The cubic root of 51147685 is about 371.2005923812.

The spelling of 51147685 in words is "fifty-one million, one hundred forty-seven thousand, six hundred eighty-five".