128677697 has 2 divisors, whose sum is σ = 128677698. Its totient is φ = 128677696.

The previous prime is 128677667. The next prime is 128677729. The reversal of 128677697 is 796776821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128165041 + 512656 = 11321^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 128677697 - 2⁸ = 128677441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128677657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64338848 + 64338849.

It is an arithmetic number, because the mean of its divisors is an integer number (64338849).

Almost surely, 2^128677697 is an apocalyptic number.

It is an amenable number.

128677697 is a deficient number, since it is larger than the sum of its proper divisors (1).

128677697 is an equidigital number, since it uses as much as digits as its factorization.

128677697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The square root of 128677697 is about 11343.6192196318. The cubic root of 128677697 is about 504.8562764545.

The spelling of 128677697 in words is "one hundred twenty-eight million, six hundred seventy-seven thousand, six hundred ninety-seven".