128617161 has 8 divisors (see below), whose sum is σ = 171661920. Its totient is φ = 85658592.

The previous prime is 128617157. The next prime is 128617183. The reversal of 128617161 is 161716821.

It is a happy number.

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

It is not a de Polignac number, because 128617161 - 2² = 128617157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128617261) 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, 17980 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (21457740).

Almost surely, 2^128617161 is an apocalyptic number.

It is an amenable number.

128617161 is a deficient number, since it is larger than the sum of its proper divisors (43044759).

128617161 is a wasteful number, since it uses less digits than its factorization.

128617161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43095.

The product of its digits is 4032, while the sum is 33.

The square root of 128617161 is about 11340.9506215308. The cubic root of 128617161 is about 504.7770947105. Note that the first 3 decimals are identical.

It can be divided in two parts, 128617 and 161, that added together give a triangular number (128778 = T₅₀₇).

The spelling of 128617161 in words is "one hundred twenty-eight million, six hundred seventeen thousand, one hundred sixty-one".