51489689 has 2 divisors, whose sum is σ = 51489690. Its totient is φ = 51489688.

The previous prime is 51489679. The next prime is 51489721. The reversal of 51489689 is 98698415.

It is a happy number.

51489689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49843600 + 1646089 = 7060^2 + 1283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51489689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51489629) 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 as a sum of consecutive naturals, namely, 25744844 + 25744845.

It is an arithmetic number, because the mean of its divisors is an integer number (25744845).

Almost surely, 2^51489689 is an apocalyptic number.

It is an amenable number.

51489689 is a deficient number, since it is larger than the sum of its proper divisors (1).

51489689 is an equidigital number, since it uses as much as digits as its factorization.

51489689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 50.

The square root of 51489689 is about 7175.6316098306. The cubic root of 51489689 is about 372.0261114943.

The spelling of 51489689 in words is "fifty-one million, four hundred eighty-nine thousand, six hundred eighty-nine".