51388191 has 6 divisors (see below), whose sum is σ = 74227400. Its totient is φ = 34258788.

The previous prime is 51388171. The next prime is 51388193. The reversal of 51388191 is 19188315.

51388191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51388191 - 2⁷ = 51388063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388193) 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 5 ways as a sum of consecutive naturals, for example, 2854891 + ... + 2854908.

Almost surely, 2^51388191 is an apocalyptic number.

51388191 is a deficient number, since it is larger than the sum of its proper divisors (22839209).

51388191 is a wasteful number, since it uses less digits than its factorization.

51388191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709805 (or 5709802 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 51388191 is about 7168.5557122757. Note that the first 3 decimals coincide. The cubic root of 51388191 is about 371.7815010661.

The spelling of 51388191 in words is "fifty-one million, three hundred eighty-eight thousand, one hundred ninety-one".