51711509 has 2 divisors, whose sum is σ = 51711510. Its totient is φ = 51711508.

The previous prime is 51711497. The next prime is 51711523. The reversal of 51711509 is 90511715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 9591409 = 6490^2 + 3097^2 .

It is a cyclic number.

It is not a de Polignac number, because 51711509 - 2¹² = 51707413 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 (51711589) 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, 25855754 + 25855755.

It is an arithmetic number, because the mean of its divisors is an integer number (25855755).

Almost surely, 2^51711509 is an apocalyptic number.

It is an amenable number.

51711509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51711509 is an equidigital number, since it uses as much as digits as its factorization.

51711509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1575, while the sum is 29.

The square root of 51711509 is about 7191.0714778814. The cubic root of 51711509 is about 372.5595814788.

The spelling of 51711509 in words is "fifty-one million, seven hundred eleven thousand, five hundred nine".