51249845851 has 2 divisors, whose sum is σ = 51249845852. Its totient is φ = 51249845850.

The previous prime is 51249845849. The next prime is 51249845861. The reversal of 51249845851 is 15854894215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51249845851 - 2¹ = 51249845849 is a prime.

Together with 51249845849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51249845831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624922925 + 25624922926.

It is an arithmetic number, because the mean of its divisors is an integer number (25624922926).

Almost surely, 2^51249845851 is an apocalyptic number.

51249845851 is a deficient number, since it is larger than the sum of its proper divisors (1).

51249845851 is an equidigital number, since it uses as much as digits as its factorization.

51249845851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304000, while the sum is 52.

The spelling of 51249845851 in words is "fifty-one billion, two hundred forty-nine million, eight hundred forty-five thousand, eight hundred fifty-one".