128149617 has 8 divisors (see below), whose sum is σ = 170918496. Its totient is φ = 85406912.

The previous prime is 128149607. The next prime is 128149631. The reversal of 128149617 is 716941821.

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 128149617 - 2²⁰ = 127101041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128149607) 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, 15358 + ... + 22184.

It is an arithmetic number, because the mean of its divisors is an integer number (21364812).

Almost surely, 2^128149617 is an apocalyptic number.

It is an amenable number.

128149617 is a deficient number, since it is larger than the sum of its proper divisors (42768879).

128149617 is an equidigital number, since it uses as much as digits as its factorization.

128149617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13087.

The product of its digits is 24192, while the sum is 39.

The square root of 128149617 is about 11320.3187675966. The cubic root of 128149617 is about 504.1647035084.

The spelling of 128149617 in words is "one hundred twenty-eight million, one hundred forty-nine thousand, six hundred seventeen".