51078385 has 4 divisors (see below), whose sum is σ = 61294068. Its totient is φ = 40862704.

The previous prime is 51078371. The next prime is 51078407. The reversal of 51078385 is 58387015.

51078385 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, and also an emirpimes, since its reverse is a distinct semiprime: 58387015 = 5 ⋅11677403.

It can be written as a sum of positive squares in 2 ways, for example, as 12439729 + 38638656 = 3527^2 + 6216^2 .

It is a cyclic number.

It is not a de Polignac number, because 51078385 - 2¹⁷ = 50947313 is a prime.

It is a Duffinian 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, 5107834 + ... + 5107843.

It is an arithmetic number, because the mean of its divisors is an integer number (15323517).

Almost surely, 2^51078385 is an apocalyptic number.

It is an amenable number.

51078385 is a deficient number, since it is larger than the sum of its proper divisors (10215683).

51078385 is a wasteful number, since it uses less digits than its factorization.

51078385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10215682.

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

The square root of 51078385 is about 7146.9143691526. The cubic root of 51078385 is about 371.0328700446.

The spelling of 51078385 in words is "fifty-one million, seventy-eight thousand, three hundred eighty-five".