51605789 has 2 divisors, whose sum is σ = 51605790. Its totient is φ = 51605788.

The previous prime is 51605783. The next prime is 51605809. The reversal of 51605789 is 98750615.

51605789 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., 35940025 + 15665764 = 5995^2 + 3958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51605789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51605783) 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, 25802894 + 25802895.

It is an arithmetic number, because the mean of its divisors is an integer number (25802895).

Almost surely, 2^51605789 is an apocalyptic number.

It is an amenable number.

51605789 is a deficient number, since it is larger than the sum of its proper divisors (1).

51605789 is an equidigital number, since it uses as much as digits as its factorization.

51605789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 51605789 is about 7183.7169348465. The cubic root of 51605789 is about 372.3055189473.

The spelling of 51605789 in words is "fifty-one million, six hundred five thousand, seven hundred eighty-nine".