51757609 has 2 divisors, whose sum is σ = 51757610. Its totient is φ = 51757608.

The previous prime is 51757591. The next prime is 51757619. The reversal of 51757609 is 90675715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51552400 + 205209 = 7180^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 51757609 - 2¹⁹ = 51233321 is a prime.

It is not a weakly prime, because it can be changed into another prime (51757619) 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, 25878804 + 25878805.

It is an arithmetic number, because the mean of its divisors is an integer number (25878805).

Almost surely, 2^51757609 is an apocalyptic number.

It is an amenable number.

51757609 is a deficient number, since it is larger than the sum of its proper divisors (1).

51757609 is an equidigital number, since it uses as much as digits as its factorization.

51757609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66150, while the sum is 40.

The square root of 51757609 is about 7194.2761275892. The cubic root of 51757609 is about 372.6702589393.

The spelling of 51757609 in words is "fifty-one million, seven hundred fifty-seven thousand, six hundred nine".