51121144243 has 16 divisors (see below), whose sum is σ = 55630927296. Its totient is φ = 46694390400.

The previous prime is 51121144219. The next prime is 51121144247. The reversal of 51121144243 is 34244112115.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51121144243 - 2⁵ = 51121144211 is a prime.

It is a super-2 number, since 2×51121144243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51121144247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2454130 + ... + 2474872.

It is an arithmetic number, because the mean of its divisors is an integer number (3476932956).

Almost surely, 2^51121144243 is an apocalyptic number.

51121144243 is a deficient number, since it is larger than the sum of its proper divisors (4509783053).

51121144243 is a wasteful number, since it uses less digits than its factorization.

51121144243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22734.

The product of its digits is 3840, while the sum is 28.

Adding to 51121144243 its reverse (34244112115), we get a palindrome (85365256358).

It can be divided in two parts, 51121 and 144243, that added together give a square (195364 = 442²).

The spelling of 51121144243 in words is "fifty-one billion, one hundred twenty-one million, one hundred forty-four thousand, two hundred forty-three".