51247393 has 2 divisors, whose sum is σ = 51247394. Its totient is φ = 51247392.

The previous prime is 51247373. The next prime is 51247411. The reversal of 51247393 is 39374215.

51247393 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., 44528929 + 6718464 = 6673^2 + 2592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51247393 is a prime.

It is not a weakly prime, because it can be changed into another prime (51247373) 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, 25623696 + 25623697.

It is an arithmetic number, because the mean of its divisors is an integer number (25623697).

Almost surely, 2^51247393 is an apocalyptic number.

It is an amenable number.

51247393 is a deficient number, since it is larger than the sum of its proper divisors (1).

51247393 is an equidigital number, since it uses as much as digits as its factorization.

51247393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 51247393 is about 7158.7284485445. The cubic root of 51247393 is about 371.4416436580.

The spelling of 51247393 in words is "fifty-one million, two hundred forty-seven thousand, three hundred ninety-three".