51541443121 has 4 divisors (see below), whose sum is σ = 58904506432. Its totient is φ = 44178379812.

The previous prime is 51541443119. The next prime is 51541443137. The reversal of 51541443121 is 12134414515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12134414515 = 5 ⋅2426882903.

It is not a de Polignac number, because 51541443121 - 2¹ = 51541443119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51541443181) 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, 3681531645 + ... + 3681531658.

It is an arithmetic number, because the mean of its divisors is an integer number (14726126608).

Almost surely, 2^51541443121 is an apocalyptic number.

It is an amenable number.

51541443121 is a deficient number, since it is larger than the sum of its proper divisors (7363063311).

51541443121 is an equidigital number, since it uses as much as digits as its factorization.

51541443121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7363063310.

The product of its digits is 9600, while the sum is 31.

Adding to 51541443121 its reverse (12134414515), we get a palindrome (63675857636).

The spelling of 51541443121 in words is "fifty-one billion, five hundred forty-one million, four hundred forty-three thousand, one hundred twenty-one".