127928689169 has 2 divisors, whose sum is σ = 127928689170. Its totient is φ = 127928689168.

The previous prime is 127928689121. The next prime is 127928689193. The reversal of 127928689169 is 961986829721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81051243025 + 46877446144 = 284695^2 + 216512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127928689169 is a prime.

It is a super-2 number, since 2×127928689169² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 127928689099 and 127928689108.

It is not a weakly prime, because it can be changed into another prime (127928680169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63964344584 + 63964344585.

It is an arithmetic number, because the mean of its divisors is an integer number (63964344585).

Almost surely, 2^127928689169 is an apocalyptic number.

It is an amenable number.

127928689169 is a deficient number, since it is larger than the sum of its proper divisors (1).

127928689169 is an equidigital number, since it uses as much as digits as its factorization.

127928689169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 68.

The spelling of 127928689169 in words is "one hundred twenty-seven billion, nine hundred twenty-eight million, six hundred eighty-nine thousand, one hundred sixty-nine".