128941622209 has 4 divisors (see below), whose sum is σ = 128951985604. Its totient is φ = 128931258816.

The previous prime is 128941622203. The next prime is 128941622231. The reversal of 128941622209 is 902226149821.

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 121354689600 + 7586932609 = 348360^2 + 87103^2 .

It is a cyclic number.

It is not a de Polignac number, because 128941622209 - 2¹³ = 128941614017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128941622203) 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, 5163012 + ... + 5187925.

It is an arithmetic number, because the mean of its divisors is an integer number (32237996401).

Almost surely, 2^128941622209 is an apocalyptic number.

It is an amenable number.

128941622209 is a deficient number, since it is larger than the sum of its proper divisors (10363395).

128941622209 is a wasteful number, since it uses less digits than its factorization.

128941622209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10363394.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 128941622209 in words is "one hundred twenty-eight billion, nine hundred forty-one million, six hundred twenty-two thousand, two hundred nine".