51541330121 has 4 divisors (see below), whose sum is σ = 51541835412. Its totient is φ = 51540824832.

The previous prime is 51541330111. The next prime is 51541330129. The reversal of 51541330121 is 12103314515.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12103314515 = 5 ⋅2420662903.

It can be written as a sum of positive squares in 2 ways, for example, as 34433998096 + 17107332025 = 185564^2 + 130795^2 .

It is a cyclic number.

It is not a de Polignac number, because 51541330121 - 2²⁶ = 51474221257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51541330129) 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 in 3 ways as a sum of consecutive naturals, for example, 39956 + ... + 323541.

It is an arithmetic number, because the mean of its divisors is an integer number (12885458853).

Almost surely, 2^51541330121 is an apocalyptic number.

It is an amenable number.

51541330121 is a deficient number, since it is larger than the sum of its proper divisors (505291).

51541330121 is a wasteful number, since it uses less digits than its factorization.

51541330121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505290.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 51541330121 its reverse (12103314515), we get a palindrome (63644644636).

The spelling of 51541330121 in words is "fifty-one billion, five hundred forty-one million, three hundred thirty thousand, one hundred twenty-one".