127012909 has 2 divisors, whose sum is σ = 127012910. Its totient is φ = 127012908.

The previous prime is 127012903. The next prime is 127012913. The reversal of 127012909 is 909210721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127012900 + 9 = 11270^2 + 3^2 .

It is an emirp because it is prime and its reverse (909210721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127012909 - 2³ = 127012901 is a prime.

It is a super-2 number, since 2×127012909² = 32264558105284562, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127012901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63506454 + 63506455.

It is an arithmetic number, because the mean of its divisors is an integer number (63506455).

Almost surely, 2^127012909 is an apocalyptic number.

It is an amenable number.

127012909 is a deficient number, since it is larger than the sum of its proper divisors (1).

127012909 is an equidigital number, since it uses as much as digits as its factorization.

127012909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 127012909 is about 11270.0003992901. Note that the first 3 decimals coincide. The cubic root of 127012909 is about 502.6695997733.

The spelling of 127012909 in words is "one hundred twenty-seven million, twelve thousand, nine hundred nine".