51386172 has 24 divisors (see below), whose sum is σ = 126954576. Its totient is φ = 16121088.

The previous prime is 51386171. The next prime is 51386177. The reversal of 51386172 is 27168315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51386171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125743 + ... + 126150.

It is an arithmetic number, because the mean of its divisors is an integer number (5289774).

Almost surely, 2^51386172 is an apocalyptic number.

It is an amenable number.

51386172 is an abundant number, since it is smaller than the sum of its proper divisors (75568404).

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

51386172 is a wasteful number, since it uses less digits than its factorization.

51386172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251917 (or 251915 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 51386172 is about 7168.4148875466. The cubic root of 51386172 is about 371.7766320053.

The spelling of 51386172 in words is "fifty-one million, three hundred eighty-six thousand, one hundred seventy-two".