128001109 has 8 divisors (see below), whose sum is σ = 135648000. Its totient is φ = 120367296.

The previous prime is 128001101. The next prime is 128001121. The reversal of 128001109 is 901100821.

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

It is a cyclic number.

It is not a de Polignac number, because 128001109 - 2³ = 128001101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128001109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128001101) 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, 22972 + ... + 27994.

It is an arithmetic number, because the mean of its divisors is an integer number (16956000).

Almost surely, 2^128001109 is an apocalyptic number.

It is an amenable number.

128001109 is a deficient number, since it is larger than the sum of its proper divisors (7646891).

128001109 is a wasteful number, since it uses less digits than its factorization.

128001109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6539.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 128001109 is about 11313.7575102174. The cubic root of 128001109 is about 503.9698754250.

The spelling of 128001109 in words is "one hundred twenty-eight million, one thousand, one hundred nine".