128219417 has 4 divisors (see below), whose sum is σ = 129080100. Its totient is φ = 127358736.

The previous prime is 128219407. The next prime is 128219453. The reversal of 128219417 is 714912821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 714912821 = 7 ⋅102130403.

It can be written as a sum of positive squares in 2 ways, for example, as 21799561 + 106419856 = 4669^2 + 10316^2 .

It is a cyclic number.

It is not a de Polignac number, because 128219417 - 2¹⁰ = 128218393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128219407) 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, 430118 + ... + 430415.

It is an arithmetic number, because the mean of its divisors is an integer number (32270025).

Almost surely, 2^128219417 is an apocalyptic number.

It is an amenable number.

128219417 is a deficient number, since it is larger than the sum of its proper divisors (860683).

128219417 is an equidigital number, since it uses as much as digits as its factorization.

128219417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860682.

The product of its digits is 8064, while the sum is 35.

The square root of 128219417 is about 11323.4012999628. The cubic root of 128219417 is about 504.2562223384.

The spelling of 128219417 in words is "one hundred twenty-eight million, two hundred nineteen thousand, four hundred seventeen".