51209863 has 2 divisors, whose sum is σ = 51209864. Its totient is φ = 51209862.

The previous prime is 51209843. The next prime is 51209867. The reversal of 51209863 is 36890215.

51209863 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51209863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51209867) 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, 25604931 + 25604932.

It is an arithmetic number, because the mean of its divisors is an integer number (25604932).

Almost surely, 2^51209863 is an apocalyptic number.

51209863 is a deficient number, since it is larger than the sum of its proper divisors (1).

51209863 is an equidigital number, since it uses as much as digits as its factorization.

51209863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 51209863 is about 7156.1066928882. The cubic root of 51209863 is about 371.3509489033.

The spelling of 51209863 in words is "fifty-one million, two hundred nine thousand, eight hundred sixty-three".