128175469 has 2 divisors, whose sum is σ = 128175470. Its totient is φ = 128175468.

The previous prime is 128175451. The next prime is 128175473. The reversal of 128175469 is 964571821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87048900 + 41126569 = 9330^2 + 6413^2 .

It is a cyclic number.

It is not a de Polignac number, because 128175469 - 2²¹ = 126078317 is a prime.

It is a super-2 number, since 2×128175469² = 32857901706739922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128175479) 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, 64087734 + 64087735.

It is an arithmetic number, because the mean of its divisors is an integer number (64087735).

Almost surely, 2^128175469 is an apocalyptic number.

It is an amenable number.

128175469 is a deficient number, since it is larger than the sum of its proper divisors (1).

128175469 is an equidigital number, since it uses as much as digits as its factorization.

128175469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 128175469 is about 11321.4605506533. The cubic root of 128175469 is about 504.1986034395.

The spelling of 128175469 in words is "one hundred twenty-eight million, one hundred seventy-five thousand, four hundred sixty-nine".