51155143121 has 4 divisors (see below), whose sum is σ = 51729920100. Its totient is φ = 50580366144.

The previous prime is 51155143001. The next prime is 51155143141. The reversal of 51155143121 is 12134155115.

It is a happy number.

51155143121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15598761025 + 35556382096 = 124895^2 + 188564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51155143121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51155143141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287388356 + ... + 287388533.

It is an arithmetic number, because the mean of its divisors is an integer number (12932480025).

Almost surely, 2^51155143121 is an apocalyptic number.

It is an amenable number.

51155143121 is a deficient number, since it is larger than the sum of its proper divisors (574776979).

51155143121 is an equidigital number, since it uses as much as digits as its factorization.

51155143121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574776978.

The product of its digits is 3000, while the sum is 29.

Adding to 51155143121 its reverse (12134155115), we get a palindrome (63289298236).

The spelling of 51155143121 in words is "fifty-one billion, one hundred fifty-five million, one hundred forty-three thousand, one hundred twenty-one".