51208517 has 2 divisors, whose sum is σ = 51208518. Its totient is φ = 51208516.

The previous prime is 51208501. The next prime is 51208523. The reversal of 51208517 is 71580215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42003361 + 9205156 = 6481^2 + 3034^2 .

It is a cyclic number.

It is not a de Polignac number, because 51208517 - 2⁴ = 51208501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51208517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51208117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25604258 + 25604259.

It is an arithmetic number, because the mean of its divisors is an integer number (25604259).

Almost surely, 2^51208517 is an apocalyptic number.

It is an amenable number.

51208517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51208517 is an equidigital number, since it uses as much as digits as its factorization.

51208517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 51208517 is about 7156.0126467188. The cubic root of 51208517 is about 371.3476953454.

The spelling of 51208517 in words is "fifty-one million, two hundred eight thousand, five hundred seventeen".