51249845849 has 2 divisors, whose sum is σ = 51249845850. Its totient is φ = 51249845848.

The previous prime is 51249845831. The next prime is 51249845851. The reversal of 51249845849 is 94854894215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39858126025 + 11391719824 = 199645^2 + 106732^2 .

It is a cyclic number.

It is not a de Polignac number, because 51249845849 - 2²⁸ = 50981410393 is a prime.

Together with 51249845851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51249845809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624922924 + 25624922925.

It is an arithmetic number, because the mean of its divisors is an integer number (25624922925).

Almost surely, 2^51249845849 is an apocalyptic number.

It is an amenable number.

51249845849 is a deficient number, since it is larger than the sum of its proper divisors (1).

51249845849 is an equidigital number, since it uses as much as digits as its factorization.

51249845849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16588800, while the sum is 59.

The spelling of 51249845849 in words is "fifty-one billion, two hundred forty-nine million, eight hundred forty-five thousand, eight hundred forty-nine".