127666129 has 2 divisors, whose sum is σ = 127666130. Its totient is φ = 127666128.

The previous prime is 127666117. The next prime is 127666151. The reversal of 127666129 is 921666721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94867600 + 32798529 = 9740^2 + 5727^2 .

It is an emirp because it is prime and its reverse (921666721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127666129 - 2¹¹ = 127664081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 127666091 and 127666100.

It is not a weakly prime, because it can be changed into another prime (127666159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63833064 + 63833065.

It is an arithmetic number, because the mean of its divisors is an integer number (63833065).

Almost surely, 2^127666129 is an apocalyptic number.

It is an amenable number.

127666129 is a deficient number, since it is larger than the sum of its proper divisors (1).

127666129 is an equidigital number, since it uses as much as digits as its factorization.

127666129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 127666129 is about 11298.9437116927. The cubic root of 127666129 is about 503.5298601983.

The spelling of 127666129 in words is "one hundred twenty-seven million, six hundred sixty-six thousand, one hundred twenty-nine".