51849915133 has 2 divisors, whose sum is σ = 51849915134. Its totient is φ = 51849915132.

The previous prime is 51849915049. The next prime is 51849915167. The reversal of 51849915133 is 33151994815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50016191449 + 1833723684 = 223643^2 + 42822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51849915133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51849615133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25924957566 + 25924957567.

It is an arithmetic number, because the mean of its divisors is an integer number (25924957567).

Almost surely, 2^51849915133 is an apocalyptic number.

It is an amenable number.

51849915133 is a deficient number, since it is larger than the sum of its proper divisors (1).

51849915133 is an equidigital number, since it uses as much as digits as its factorization.

51849915133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 49.

The spelling of 51849915133 in words is "fifty-one billion, eight hundred forty-nine million, nine hundred fifteen thousand, one hundred thirty-three".