51302171 has 2 divisors, whose sum is σ = 51302172. Its totient is φ = 51302170.

The previous prime is 51302161. The next prime is 51302191. The reversal of 51302171 is 17120315.

It is an a-pointer prime, because the next prime (51302191) can be obtained adding 51302171 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51302171 is a prime.

It is not a weakly prime, because it can be changed into another prime (51302161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25651085 + 25651086.

It is an arithmetic number, because the mean of its divisors is an integer number (25651086).

Almost surely, 2^51302171 is an apocalyptic number.

51302171 is a deficient number, since it is larger than the sum of its proper divisors (1).

51302171 is an equidigital number, since it uses as much as digits as its factorization.

51302171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 51302171 is about 7162.5533854904. The cubic root of 51302171 is about 371.5739403723.

Adding to 51302171 its reverse (17120315), we get a palindrome (68422486).

The spelling of 51302171 in words is "fifty-one million, three hundred two thousand, one hundred seventy-one".