128009211 has 8 divisors (see below), whose sum is σ = 186195264. Its totient is φ = 77581320.

The previous prime is 128009207. The next prime is 128009239. The reversal of 128009211 is 112900821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128009211 - 2² = 128009207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128009281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1939501 + ... + 1939566.

It is an arithmetic number, because the mean of its divisors is an integer number (23274408).

Almost surely, 2^128009211 is an apocalyptic number.

128009211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128009211 is a deficient number, since it is larger than the sum of its proper divisors (58186053).

128009211 is a wasteful number, since it uses less digits than its factorization.

128009211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879081.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 128009211 is about 11314.1155641968. The cubic root of 128009211 is about 503.9805083480.

The spelling of 128009211 in words is "one hundred twenty-eight million, nine thousand, two hundred eleven".