128380161 has 32 divisors (see below), whose sum is σ = 211364608. Its totient is φ = 67495680.

The previous prime is 128380159. The next prime is 128380183. The reversal of 128380161 is 161083821.

It is not a de Polignac number, because 128380161 - 2¹ = 128380159 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128380561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114375 + ... + 115491.

It is an arithmetic number, because the mean of its divisors is an integer number (6605144).

Almost surely, 2^128380161 is an apocalyptic number.

It is an amenable number.

128380161 is a deficient number, since it is larger than the sum of its proper divisors (82984447).

128380161 is a wasteful number, since it uses less digits than its factorization.

128380161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 128380161 is about 11330.4969440886. The cubic root of 128380161 is about 504.4668568775.

The spelling of 128380161 in words is "one hundred twenty-eight million, three hundred eighty thousand, one hundred sixty-one".