128099071 has 4 divisors (see below), whose sum is σ = 128123032. Its totient is φ = 128075112.

The previous prime is 128099057. The next prime is 128099113. The reversal of 128099071 is 170990821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170990821 = 2689 ⋅63589.

It is a cyclic number.

It is not a de Polignac number, because 128099071 - 2¹⁵ = 128066303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128099071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128099011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100 + ... + 16006.

It is an arithmetic number, because the mean of its divisors is an integer number (32030758).

Almost surely, 2^128099071 is an apocalyptic number.

128099071 is the 6535-th hex number.

128099071 is a deficient number, since it is larger than the sum of its proper divisors (23961).

128099071 is an equidigital number, since it uses as much as digits as its factorization.

128099071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23960.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 128099071 is about 11318.0860131031. The cubic root of 128099071 is about 504.0984089668.

The spelling of 128099071 in words is "one hundred twenty-eight million, ninety-nine thousand, seventy-one".