51755257 has 2 divisors, whose sum is σ = 51755258. Its totient is φ = 51755256.

The previous prime is 51755239. The next prime is 51755281. The reversal of 51755257 is 75255715.

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., 31854736 + 19900521 = 5644^2 + 4461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51755257 is a prime.

It is not a weakly prime, because it can be changed into another prime (51755287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25877628 + 25877629.

It is an arithmetic number, because the mean of its divisors is an integer number (25877629).

Almost surely, 2^51755257 is an apocalyptic number.

It is an amenable number.

51755257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51755257 is an equidigital number, since it uses as much as digits as its factorization.

51755257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61250, while the sum is 37.

The square root of 51755257 is about 7194.1126624484. The cubic root of 51755257 is about 372.6646138194.

The spelling of 51755257 in words is "fifty-one million, seven hundred fifty-five thousand, two hundred fifty-seven".