128669297 has 2 divisors, whose sum is σ = 128669298. Its totient is φ = 128669296.

The previous prime is 128669263. The next prime is 128669309. The reversal of 128669297 is 792966821.

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., 84566416 + 44102881 = 9196^2 + 6641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128669297 is a prime.

It is not a weakly prime, because it can be changed into another prime (128669207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64334648 + 64334649.

It is an arithmetic number, because the mean of its divisors is an integer number (64334649).

Almost surely, 2^128669297 is an apocalyptic number.

It is an amenable number.

128669297 is a deficient number, since it is larger than the sum of its proper divisors (1).

128669297 is an equidigital number, since it uses as much as digits as its factorization.

128669297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 128669297 is about 11343.2489613867. The cubic root of 128669297 is about 504.8452906476.

The spelling of 128669297 in words is "one hundred twenty-eight million, six hundred sixty-nine thousand, two hundred ninety-seven".