51065257 has 2 divisors, whose sum is σ = 51065258. Its totient is φ = 51065256.

The previous prime is 51065233. The next prime is 51065269. The reversal of 51065257 is 75256015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 9217296 = 6469^2 + 3036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51065257 is a prime.

It is not a weakly prime, because it can be changed into another prime (51065057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25532628 + 25532629.

It is an arithmetic number, because the mean of its divisors is an integer number (25532629).

Almost surely, 2^51065257 is an apocalyptic number.

It is an amenable number.

51065257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51065257 is an equidigital number, since it uses as much as digits as its factorization.

51065257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 51065257 is about 7145.9958718152. The cubic root of 51065257 is about 371.0010801014.

The spelling of 51065257 in words is "fifty-one million, sixty-five thousand, two hundred fifty-seven".