128266117 has 4 divisors (see below), whose sum is σ = 146589856. Its totient is φ = 109942380.

The previous prime is 128266097. The next prime is 128266129. The reversal of 128266117 is 711662821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128266117 - 2¹¹ = 128264069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128266157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9161859 + ... + 9161872.

It is an arithmetic number, because the mean of its divisors is an integer number (36647464).

Almost surely, 2^128266117 is an apocalyptic number.

It is an amenable number.

128266117 is a deficient number, since it is larger than the sum of its proper divisors (18323739).

128266117 is an equidigital number, since it uses as much as digits as its factorization.

128266117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18323738.

The product of its digits is 8064, while the sum is 34.

The square root of 128266117 is about 11325.4632134849. The cubic root of 128266117 is about 504.3174348748.

The spelling of 128266117 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, one hundred seventeen".