128444161 has 12 divisors (see below), whose sum is σ = 140246100. Its totient is φ = 117478368.

The previous prime is 128444149. The next prime is 128444207. The reversal of 128444161 is 161444821.

It can be written as a sum of positive squares in 2 ways, for example, as 99121936 + 29322225 = 9956^2 + 5415^2 .

It is not a de Polignac number, because 128444161 - 2⁷ = 128444033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128444111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4335 + ... + 16603.

It is an arithmetic number, because the mean of its divisors is an integer number (11687175).

Almost surely, 2^128444161 is an apocalyptic number.

It is an amenable number.

128444161 is a deficient number, since it is larger than the sum of its proper divisors (11801939).

128444161 is a wasteful number, since it uses less digits than its factorization.

128444161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12336 (or 12317 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 128444161 is about 11333.3208284245. The cubic root of 128444161 is about 504.5506717884.

Adding to 128444161 its reverse (161444821), we get a palindrome (289888982).

The spelling of 128444161 in words is "one hundred twenty-eight million, four hundred forty-four thousand, one hundred sixty-one".