51755239 has 2 divisors, whose sum is σ = 51755240. Its totient is φ = 51755238.

The previous prime is 51755233. The next prime is 51755257. The reversal of 51755239 is 93255715.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51755239 - 2¹⁹ = 51230951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51755198 and 51755207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51755233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25877619 + 25877620.

It is an arithmetic number, because the mean of its divisors is an integer number (25877620).

Almost surely, 2^51755239 is an apocalyptic number.

51755239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51755239 is an equidigital number, since it uses as much as digits as its factorization.

51755239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47250, while the sum is 37.

The square root of 51755239 is about 7194.1114114253. Note that the first 3 decimals coincide. The cubic root of 51755239 is about 372.6645706163.

The spelling of 51755239 in words is "fifty-one million, seven hundred fifty-five thousand, two hundred thirty-nine".