128422117 has 4 divisors (see below), whose sum is σ = 128452716. Its totient is φ = 128391520.

The previous prime is 128422103. The next prime is 128422139. The reversal of 128422117 is 711224821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57289761 + 71132356 = 7569^2 + 8434^2 .

It is a cyclic number.

It is not a de Polignac number, because 128422117 - 2¹⁹ = 127897829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128422157) 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, 7768 + ... + 17809.

It is an arithmetic number, because the mean of its divisors is an integer number (32113179).

Almost surely, 2^128422117 is an apocalyptic number.

It is an amenable number.

128422117 is a deficient number, since it is larger than the sum of its proper divisors (30599).

128422117 is an equidigital number, since it uses as much as digits as its factorization.

128422117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30598.

The product of its digits is 1792, while the sum is 28.

The square root of 128422117 is about 11332.3482562089. The cubic root of 128422117 is about 504.5218059340.

Adding to 128422117 its reverse (711224821), we get a palindrome (839646938).

The spelling of 128422117 in words is "one hundred twenty-eight million, four hundred twenty-two thousand, one hundred seventeen".