51451638 has 32 divisors (see below), whose sum is σ = 120476160. Its totient is φ = 14341440.

The previous prime is 51451627. The next prime is 51451663. The reversal of 51451638 is 83615415.

51451638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51451599 and 51451608.

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 15 ways as a sum of consecutive naturals, for example, 13218 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (3764880).

Almost surely, 2^51451638 is an apocalyptic number.

51451638 is an abundant number, since it is smaller than the sum of its proper divisors (69024522).

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

51451638 is a wasteful number, since it uses less digits than its factorization.

51451638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29932.

The product of its digits is 14400, while the sum is 33.

The square root of 51451638 is about 7172.9797155715. The cubic root of 51451638 is about 371.9344461896.

The spelling of 51451638 in words is "fifty-one million, four hundred fifty-one thousand, six hundred thirty-eight".