128609001 has 24 divisors (see below), whose sum is σ = 190773440. Its totient is φ = 83444256.

The previous prime is 128608981. The next prime is 128609017. The reversal of 128609001 is 100906821.

It is not a de Polignac number, because 128609001 - 2⁵ = 128608969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128609021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169515 + ... + 170271.

Almost surely, 2^128609001 is an apocalyptic number.

It is an amenable number.

128609001 is a deficient number, since it is larger than the sum of its proper divisors (62164439).

128609001 is a wasteful number, since it uses less digits than its factorization.

128609001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 128609001 is about 11340.5908576229. The cubic root of 128609001 is about 504.7664194419.

The spelling of 128609001 in words is "one hundred twenty-eight million, six hundred nine thousand, one".