128811197 has 2 divisors, whose sum is σ = 128811198. Its totient is φ = 128811196.

The previous prime is 128811191. The next prime is 128811257. The reversal of 128811197 is 791118821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112763161 + 16048036 = 10619^2 + 4006^2 .

It is a cyclic number.

It is not a de Polignac number, because 128811197 - 2⁴ = 128811181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128811197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128811191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64405598 + 64405599.

It is an arithmetic number, because the mean of its divisors is an integer number (64405599).

Almost surely, 2^128811197 is an apocalyptic number.

It is an amenable number.

128811197 is a deficient number, since it is larger than the sum of its proper divisors (1).

128811197 is an equidigital number, since it uses as much as digits as its factorization.

128811197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 38.

The square root of 128811197 is about 11349.5020595619. The cubic root of 128811197 is about 505.0308081718.

The spelling of 128811197 in words is "one hundred twenty-eight million, eight hundred eleven thousand, one hundred ninety-seven".