128171813 has 8 divisors (see below), whose sum is σ = 159798720. Its totient is φ = 99874080.

The previous prime is 128171803. The next prime is 128171833. The reversal of 128171813 is 318171821.

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 128171813 - 2²⁰ = 127123237 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 128171813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128171803) 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 7 ways as a sum of consecutive naturals, for example, 832208 + ... + 832361.

It is an arithmetic number, because the mean of its divisors is an integer number (19974840).

Almost surely, 2^128171813 is an apocalyptic number.

It is an amenable number.

128171813 is a deficient number, since it is larger than the sum of its proper divisors (31626907).

128171813 is a wasteful number, since it uses less digits than its factorization.

128171813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664587.

The product of its digits is 2688, while the sum is 32.

The square root of 128171813 is about 11321.2990862356. The cubic root of 128171813 is about 504.1938095747.

The spelling of 128171813 in words is "one hundred twenty-eight million, one hundred seventy-one thousand, eight hundred thirteen".