51078251 has 48 divisors (see below), whose sum is σ = 69128640. Its totient is φ = 36771840.

The previous prime is 51078233. The next prime is 51078259. The reversal of 51078251 is 15287015.

51078251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-51078251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51078259) 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 47 ways as a sum of consecutive naturals, for example, 1245791 + ... + 1245831.

It is an arithmetic number, because the mean of its divisors is an integer number (1440180).

Almost surely, 2^51078251 is an apocalyptic number.

51078251 is a deficient number, since it is larger than the sum of its proper divisors (18050389).

51078251 is a wasteful number, since it uses less digits than its factorization.

51078251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 51078251 is about 7146.9049944714. The cubic root of 51078251 is about 371.0325455861.

The spelling of 51078251 in words is "fifty-one million, seventy-eight thousand, two hundred fifty-one".