51135111161 has 4 divisors (see below), whose sum is σ = 51135584592. Its totient is φ = 51134637732.

The previous prime is 51135111109. The next prime is 51135111163. The reversal of 51135111161 is 16111153115.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51135111161 - 2¹⁰ = 51135110137 is a prime.

It is a super-2 number, since 2×51135111161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51135111161.

It is not an unprimeable number, because it can be changed into a prime (51135111163) 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, 13370 + ... + 320076.

It is an arithmetic number, because the mean of its divisors is an integer number (12783896148).

Almost surely, 2^51135111161 is an apocalyptic number.

It is an amenable number.

51135111161 is a deficient number, since it is larger than the sum of its proper divisors (473431).

51135111161 is a wasteful number, since it uses less digits than its factorization.

51135111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473430.

The product of its digits is 450, while the sum is 26.

Adding to 51135111161 its reverse (16111153115), we get a palindrome (67246264276).

The spelling of 51135111161 in words is "fifty-one billion, one hundred thirty-five million, one hundred eleven thousand, one hundred sixty-one".