51123531611 has 16 divisors (see below), whose sum is σ = 53937635328. Its totient is φ = 48393223200.

The previous prime is 51123531607. The next prime is 51123531619. The reversal of 51123531611 is 11613532115.

It is a cyclic number.

It is not a de Polignac number, because 51123531611 - 2² = 51123531607 is a prime.

It is a super-2 number, since 2×51123531611² (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 (51123531619) 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 15 ways as a sum of consecutive naturals, for example, 188081 + ... + 370973.

It is an arithmetic number, because the mean of its divisors is an integer number (3371102208).

Almost surely, 2^51123531611 is an apocalyptic number.

51123531611 is a deficient number, since it is larger than the sum of its proper divisors (2814103717).

51123531611 is a wasteful number, since it uses less digits than its factorization.

51123531611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183122.

The product of its digits is 2700, while the sum is 29.

The spelling of 51123531611 in words is "fifty-one billion, one hundred twenty-three million, five hundred thirty-one thousand, six hundred eleven".