128161 has 8 divisors (see below), whose sum is σ = 142848. Its totient is φ = 114000.

The previous prime is 128159. The next prime is 128173. The reversal of 128161 is 161821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128161 - 2¹ = 128159 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (128111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (17856).

2¹²⁸¹⁶¹ is an apocalyptic number.

128161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128161 is a deficient number, since it is larger than the sum of its proper divisors (14687).

128161 is a wasteful number, since it uses less digits than its factorization.

128161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263.

The product of its digits is 96, while the sum is 19.

The square root of 128161 is about 357.9958100313. The cubic root of 128161 is about 50.4179630688.

Adding to 128161 its reverse (161821), we get a palindrome (289982).

It can be divided in two parts, 128 and 161, that added together give a square (289 = 17²).

The spelling of 128161 in words is "one hundred twenty-eight thousand, one hundred sixty-one".