51705161 has 2 divisors, whose sum is σ = 51705162. Its totient is φ = 51705160.

The previous prime is 51705151. The next prime is 51705163. The reversal of 51705161 is 16150715.

51705161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32947600 + 18757561 = 5740^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 51705161 - 2¹⁰ = 51704137 is a prime.

Together with 51705163, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51705161.

It is not a weakly prime, because it can be changed into another prime (51705163) 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, 25852580 + 25852581.

It is an arithmetic number, because the mean of its divisors is an integer number (25852581).

Almost surely, 2^51705161 is an apocalyptic number.

It is an amenable number.

51705161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51705161 is an equidigital number, since it uses as much as digits as its factorization.

51705161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 51705161 is about 7190.6300836575. The cubic root of 51705161 is about 372.5443359687.

Adding to 51705161 its reverse (16150715), we get a palindrome (67855876).

The spelling of 51705161 in words is "fifty-one million, seven hundred five thousand, one hundred sixty-one".