51631689 has 8 divisors (see below), whose sum is σ = 69338080. Its totient is φ = 34173216.

The previous prime is 51631663. The next prime is 51631747. The reversal of 51631689 is 98613615.

51631689 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 51631689 - 2¹⁶ = 51566153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51631609) 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, 61492 + ... + 62325.

It is an arithmetic number, because the mean of its divisors is an integer number (8667260).

Almost surely, 2^51631689 is an apocalyptic number.

It is an amenable number.

51631689 is a deficient number, since it is larger than the sum of its proper divisors (17706391).

51631689 is a wasteful number, since it uses less digits than its factorization.

51631689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123959.

The product of its digits is 38880, while the sum is 39.

The square root of 51631689 is about 7185.5193966755. The cubic root of 51631689 is about 372.3677929700.

The spelling of 51631689 in words is "fifty-one million, six hundred thirty-one thousand, six hundred eighty-nine".