51747891 has 8 divisors (see below), whose sum is σ = 74304720. Its totient is φ = 31844832.

The previous prime is 51747889. The next prime is 51747901. The reversal of 51747891 is 19874715.

51747891 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 51747891 - 2¹ = 51747889 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51747391) 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 7 ways as a sum of consecutive naturals, for example, 663396 + ... + 663473.

It is an arithmetic number, because the mean of its divisors is an integer number (9288090).

Almost surely, 2^51747891 is an apocalyptic number.

51747891 is a deficient number, since it is larger than the sum of its proper divisors (22556829).

51747891 is a wasteful number, since it uses less digits than its factorization.

51747891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326885.

The product of its digits is 70560, while the sum is 42.

The square root of 51747891 is about 7193.6006978425. The cubic root of 51747891 is about 372.6469333109.

The spelling of 51747891 in words is "fifty-one million, seven hundred forty-seven thousand, eight hundred ninety-one".