51335512169 has 2 divisors, whose sum is σ = 51335512170. Its totient is φ = 51335512168.

The previous prime is 51335512099. The next prime is 51335512171. The reversal of 51335512169 is 96121553315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27569281600 + 23766230569 = 166040^2 + 154163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51335512169 is a prime.

It is a super-2 number, since 2×51335512169² (a number of 22 digits) contains 22 as substring.

Together with 51335512171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51335512199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25667756084 + 25667756085.

It is an arithmetic number, because the mean of its divisors is an integer number (25667756085).

Almost surely, 2^51335512169 is an apocalyptic number.

It is an amenable number.

51335512169 is a deficient number, since it is larger than the sum of its proper divisors (1).

51335512169 is an equidigital number, since it uses as much as digits as its factorization.

51335512169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 41.

The spelling of 51335512169 in words is "fifty-one billion, three hundred thirty-five million, five hundred twelve thousand, one hundred sixty-nine".