51308657 has 2 divisors, whose sum is σ = 51308658. Its totient is φ = 51308656.

The previous prime is 51308629. The next prime is 51308681. The reversal of 51308657 is 75680315.

51308657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46362481 + 4946176 = 6809^2 + 2224^2 .

It is a cyclic number.

It is not a de Polignac number, because 51308657 - 2⁸ = 51308401 is a prime.

It is not a weakly prime, because it can be changed into another prime (51308617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25654328 + 25654329.

It is an arithmetic number, because the mean of its divisors is an integer number (25654329).

Almost surely, 2^51308657 is an apocalyptic number.

It is an amenable number.

51308657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51308657 is an equidigital number, since it uses as much as digits as its factorization.

51308657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 51308657 is about 7163.0061426750. The cubic root of 51308657 is about 371.5895987546.

The spelling of 51308657 in words is "fifty-one million, three hundred eight thousand, six hundred fifty-seven".