51061685 has 8 divisors (see below), whose sum is σ = 61312896. Its totient is φ = 40823440.

The previous prime is 51061667. The next prime is 51061691. The reversal of 51061685 is 58616015.

It is a happy number.

51061685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51061685 - 2⁸ = 51061429 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 7 ways as a sum of consecutive naturals, for example, 11672 + ... + 15438.

It is an arithmetic number, because the mean of its divisors is an integer number (7664112).

Almost surely, 2^51061685 is an apocalyptic number.

It is an amenable number.

51061685 is a deficient number, since it is larger than the sum of its proper divisors (10251211).

51061685 is a wasteful number, since it uses less digits than its factorization.

51061685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 51061685 is about 7145.7459372693. The cubic root of 51061685 is about 370.9924294268.

The spelling of 51061685 in words is "fifty-one million, sixty-one thousand, six hundred eighty-five".