51729617 has 2 divisors, whose sum is σ = 51729618. Its totient is φ = 51729616.

The previous prime is 51729583. The next prime is 51729683. The reversal of 51729617 is 71692715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43612816 + 8116801 = 6604^2 + 2849^2 .

It is a cyclic number.

It is not a de Polignac number, because 51729617 - 2⁸ = 51729361 is a prime.

It is not a weakly prime, because it can be changed into another prime (51729697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25864808 + 25864809.

It is an arithmetic number, because the mean of its divisors is an integer number (25864809).

Almost surely, 2^51729617 is an apocalyptic number.

It is an amenable number.

51729617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51729617 is an equidigital number, since it uses as much as digits as its factorization.

51729617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 38.

The square root of 51729617 is about 7192.3304290056. The cubic root of 51729617 is about 372.6030632345.

The spelling of 51729617 in words is "fifty-one million, seven hundred twenty-nine thousand, six hundred seventeen".