51500257 has 2 divisors, whose sum is σ = 51500258. Its totient is φ = 51500256.

The previous prime is 51500233. The next prime is 51500299. The reversal of 51500257 is 75200515.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50353216 + 1147041 = 7096^2 + 1071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51500257 is a prime.

It is not a weakly prime, because it can be changed into another prime (51500227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750128 + 25750129.

It is an arithmetic number, because the mean of its divisors is an integer number (25750129).

Almost surely, 2^51500257 is an apocalyptic number.

It is an amenable number.

51500257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51500257 is an equidigital number, since it uses as much as digits as its factorization.

51500257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 51500257 is about 7176.3679532198. The cubic root of 51500257 is about 372.0515619167.

The spelling of 51500257 in words is "fifty-one million, five hundred thousand, two hundred fifty-seven".