51511121841 has 4 divisors (see below), whose sum is σ = 68681495792. Its totient is φ = 34340747892.

The previous prime is 51511121819. The next prime is 51511121869. The reversal of 51511121841 is 14812111515.

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.

It is not a de Polignac number, because 51511121841 - 2¹³ = 51511113649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51511121799 and 51511121808.

It is not an unprimeable number, because it can be changed into a prime (51511121741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8585186971 + ... + 8585186976.

It is an arithmetic number, because the mean of its divisors is an integer number (17170373948).

Almost surely, 2^51511121841 is an apocalyptic number.

It is an amenable number.

51511121841 is a deficient number, since it is larger than the sum of its proper divisors (17170373951).

51511121841 is a wasteful number, since it uses less digits than its factorization.

51511121841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17170373950.

The product of its digits is 1600, while the sum is 30.

The spelling of 51511121841 in words is "fifty-one billion, five hundred eleven million, one hundred twenty-one thousand, eight hundred forty-one".