128886617 has 2 divisors, whose sum is σ = 128886618. Its totient is φ = 128886616.

The previous prime is 128886587. The next prime is 128886629. The reversal of 128886617 is 716688821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90706576 + 38180041 = 9524^2 + 6179^2 .

It is an emirp because it is prime and its reverse (716688821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128886617 - 2¹⁸ = 128624473 is a prime.

It is a super-2 number, since 2×128886617² = 33223520083409378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128886647) 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, 64443308 + 64443309.

It is an arithmetic number, because the mean of its divisors is an integer number (64443309).

Almost surely, 2^128886617 is an apocalyptic number.

It is an amenable number.

128886617 is a deficient number, since it is larger than the sum of its proper divisors (1).

128886617 is an equidigital number, since it uses as much as digits as its factorization.

128886617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 47.

The square root of 128886617 is about 11352.8241860781. The cubic root of 128886617 is about 505.1293554849.

The spelling of 128886617 in words is "one hundred twenty-eight million, eight hundred eighty-six thousand, six hundred seventeen".