128397211 has 2 divisors, whose sum is σ = 128397212. Its totient is φ = 128397210.

The previous prime is 128397187. The next prime is 128397221. The reversal of 128397211 is 112793821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128397211 - 2²¹ = 126300059 is a prime.

It is not a weakly prime, because it can be changed into another prime (128397221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64198605 + 64198606.

It is an arithmetic number, because the mean of its divisors is an integer number (64198606).

Almost surely, 2^128397211 is an apocalyptic number.

128397211 is a deficient number, since it is larger than the sum of its proper divisors (1).

128397211 is an equidigital number, since it uses as much as digits as its factorization.

128397211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 128397211 is about 11331.2493132929. The cubic root of 128397211 is about 504.4891884151.

The spelling of 128397211 in words is "one hundred twenty-eight million, three hundred ninety-seven thousand, two hundred eleven".