127217989 has 2 divisors, whose sum is σ = 127217990. Its totient is φ = 127217988.

The previous prime is 127217947. The next prime is 127218071. The reversal of 127217989 is 989712721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 36397089 = 9530^2 + 6033^2 .

It is a cyclic number.

It is not a de Polignac number, because 127217989 - 2¹¹ = 127215941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127217089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63608994 + 63608995.

It is an arithmetic number, because the mean of its divisors is an integer number (63608995).

Almost surely, 2^127217989 is an apocalyptic number.

It is an amenable number.

127217989 is a deficient number, since it is larger than the sum of its proper divisors (1).

127217989 is an equidigital number, since it uses as much as digits as its factorization.

127217989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 46.

The square root of 127217989 is about 11279.0952208056. The cubic root of 127217989 is about 502.9399976119.

The spelling of 127217989 in words is "one hundred twenty-seven million, two hundred seventeen thousand, nine hundred eighty-nine".