51913318169 has 2 divisors, whose sum is σ = 51913318170. Its totient is φ = 51913318168.

The previous prime is 51913318153. The next prime is 51913318187. The reversal of 51913318169 is 96181331915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42154249225 + 9759068944 = 205315^2 + 98788^2 .

It is a cyclic number.

It is not a de Polignac number, because 51913318169 - 2⁴ = 51913318153 is a prime.

It is a super-2 number, since 2×51913318169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51913318189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25956659084 + 25956659085.

It is an arithmetic number, because the mean of its divisors is an integer number (25956659085).

Almost surely, 2^51913318169 is an apocalyptic number.

It is an amenable number.

51913318169 is a deficient number, since it is larger than the sum of its proper divisors (1).

51913318169 is an equidigital number, since it uses as much as digits as its factorization.

51913318169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 47.

The spelling of 51913318169 in words is "fifty-one billion, nine hundred thirteen million, three hundred eighteen thousand, one hundred sixty-nine".