51288173 has 4 divisors (see below), whose sum is σ = 51352380. Its totient is φ = 51223968.

The previous prime is 51288161. The next prime is 51288187. The reversal of 51288173 is 37188215.

51288173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33327529 + 17960644 = 5773^2 + 4238^2 .

It is a cyclic number.

It is not a de Polignac number, because 51288173 - 2⁸ = 51287917 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 (51288073) 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 3 ways as a sum of consecutive naturals, for example, 30890 + ... + 32507.

It is an arithmetic number, because the mean of its divisors is an integer number (12838095).

Almost surely, 2^51288173 is an apocalyptic number.

It is an amenable number.

51288173 is a deficient number, since it is larger than the sum of its proper divisors (64207).

51288173 is an equidigital number, since it uses as much as digits as its factorization.

51288173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64206.

The product of its digits is 13440, while the sum is 35.

The square root of 51288173 is about 7161.5761533338. The cubic root of 51288173 is about 371.5401421590.

The spelling of 51288173 in words is "fifty-one million, two hundred eighty-eight thousand, one hundred seventy-three".