51643859 has 2 divisors, whose sum is σ = 51643860. Its totient is φ = 51643858.

The previous prime is 51643829. The next prime is 51643877. The reversal of 51643859 is 95834615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51643859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51643829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821929 + 25821930.

It is an arithmetic number, because the mean of its divisors is an integer number (25821930).

Almost surely, 2^51643859 is an apocalyptic number.

51643859 is a deficient number, since it is larger than the sum of its proper divisors (1).

51643859 is an equidigital number, since it uses as much as digits as its factorization.

51643859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The square root of 51643859 is about 7186.3661888329. The cubic root of 51643859 is about 372.3970473557.

The spelling of 51643859 in words is "fifty-one million, six hundred forty-three thousand, eight hundred fifty-nine".