128170489 has 4 divisors (see below), whose sum is σ = 128275840. Its totient is φ = 128065140.

The previous prime is 128170481. The next prime is 128170507. The reversal of 128170489 is 984071821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984071821 = 83 ⋅11856287.

It is a cyclic number.

It is not a de Polignac number, because 128170489 - 2³ = 128170481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128170481) 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, 50829 + ... + 53290.

It is an arithmetic number, because the mean of its divisors is an integer number (32068960).

Almost surely, 2^128170489 is an apocalyptic number.

It is an amenable number.

128170489 is a deficient number, since it is larger than the sum of its proper divisors (105351).

128170489 is a wasteful number, since it uses less digits than its factorization.

128170489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105350.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 128170489 is about 11321.2406122297. The cubic root of 128170489 is about 504.1920734808.

The spelling of 128170489 in words is "one hundred twenty-eight million, one hundred seventy thousand, four hundred eighty-nine".