51681173 has 8 divisors (see below), whose sum is σ = 55117440. Its totient is φ = 48288960.

The previous prime is 51681169. The next prime is 51681181. The reversal of 51681173 is 37118615.

51681173 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 a cyclic number.

It is not a de Polignac number, because 51681173 - 2² = 51681169 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 (51684173) 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, 8573 + ... + 13298.

It is an arithmetic number, because the mean of its divisors is an integer number (6889680).

Almost surely, 2^51681173 is an apocalyptic number.

It is an amenable number.

51681173 is a deficient number, since it is larger than the sum of its proper divisors (3436267).

51681173 is a wasteful number, since it uses less digits than its factorization.

51681173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22027.

The product of its digits is 5040, while the sum is 32.

The square root of 51681173 is about 7188.9618861140. The cubic root of 51681173 is about 372.4867145390.

Adding to 51681173 its reverse (37118615), we get a palindrome (88799788).

The spelling of 51681173 in words is "fifty-one million, six hundred eighty-one thousand, one hundred seventy-three".