128597911 has 8 divisors (see below), whose sum is σ = 146636784. Its totient is φ = 111722880.

The previous prime is 128597897. The next prime is 128597923. The reversal of 128597911 is 119795821.

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 128597911 - 2⁵ = 128597879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128597941) 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, 290725 + ... + 291166.

It is an arithmetic number, because the mean of its divisors is an integer number (18329598).

Almost surely, 2^128597911 is an apocalyptic number.

128597911 is a deficient number, since it is larger than the sum of its proper divisors (18038873).

128597911 is a wasteful number, since it uses less digits than its factorization.

128597911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581921.

The product of its digits is 45360, while the sum is 43.

The square root of 128597911 is about 11340.1018954858. The cubic root of 128597911 is about 504.7519102954.

The spelling of 128597911 in words is "one hundred twenty-eight million, five hundred ninety-seven thousand, nine hundred eleven".