128155211 has 4 divisors (see below), whose sum is σ = 128193624. Its totient is φ = 128116800.

The previous prime is 128155207. The next prime is 128155249. The reversal of 128155211 is 112551821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128155211 - 2² = 128155207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128155711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13670 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (32048406).

Almost surely, 2^128155211 is an apocalyptic number.

128155211 is a deficient number, since it is larger than the sum of its proper divisors (38413).

128155211 is an equidigital number, since it uses as much as digits as its factorization.

128155211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38412.

The product of its digits is 800, while the sum is 26.

The square root of 128155211 is about 11320.5658427483. The cubic root of 128155211 is about 504.1720393511.

The spelling of 128155211 in words is "one hundred twenty-eight million, one hundred fifty-five thousand, two hundred eleven".