51945918 has 24 divisors (see below), whose sum is σ = 105168408. Its totient is φ = 17105088.

The previous prime is 51945913. The next prime is 51945947. The reversal of 51945918 is 81954915.

51945918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51945918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51945911) 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, 46980 + ... + 48072.

It is an arithmetic number, because the mean of its divisors is an integer number (4382017).

Almost surely, 2^51945918 is an apocalyptic number.

51945918 is an abundant number, since it is smaller than the sum of its proper divisors (53222490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51945918 is a wasteful number, since it uses less digits than its factorization.

With its successor (51945919) it forms an eRAP, since the sums of their prime factors are consecutive (1276 and 1277).

51945918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276 (or 1187 counting only the distinct ones).

The product of its digits is 64800, while the sum is 42.

The square root of 51945918 is about 7207.3516634059. The cubic root of 51945918 is about 373.1216722906.

The spelling of 51945918 in words is "fifty-one million, nine hundred forty-five thousand, nine hundred eighteen".