128211097 has 6 divisors (see below), whose sum is σ = 149143578. Its totient is φ = 109895184.

The previous prime is 128211091. The next prime is 128211101. The reversal of 128211097 is 790112821.

It can be written as a sum of positive squares in only one way, i.e., 70207641 + 58003456 = 8379^2 + 7616^2 .

It is not a de Polignac number, because 128211097 - 2³ = 128211089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128211091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1308228 + ... + 1308325.

It is an arithmetic number, because the mean of its divisors is an integer number (24857263).

Almost surely, 2^128211097 is an apocalyptic number.

It is an amenable number.

128211097 is a deficient number, since it is larger than the sum of its proper divisors (20932481).

128211097 is an equidigital number, since it uses as much as digits as its factorization.

128211097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616567 (or 2616560 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 128211097 is about 11323.0339132231. The cubic root of 128211097 is about 504.2453152475.

The spelling of 128211097 in words is "one hundred twenty-eight million, two hundred eleven thousand, ninety-seven".