128172593 has 4 divisors (see below), whose sum is σ = 128709120. Its totient is φ = 127636068.

The previous prime is 128172581. The next prime is 128172607. The reversal of 128172593 is 395271821.

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: 395271821 = 7 ⋅56467403.

It is a cyclic number.

It is not a de Polignac number, because 128172593 - 2¹⁰ = 128171569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128172533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267905 + ... + 268382.

It is an arithmetic number, because the mean of its divisors is an integer number (32177280).

Almost surely, 2^128172593 is an apocalyptic number.

It is an amenable number.

128172593 is a deficient number, since it is larger than the sum of its proper divisors (536527).

128172593 is an equidigital number, since it uses as much as digits as its factorization.

128172593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536526.

The product of its digits is 30240, while the sum is 38.

The square root of 128172593 is about 11321.3335345268. Note that the first 3 decimals coincide. The cubic root of 128172593 is about 504.1948323434.

The spelling of 128172593 in words is "one hundred twenty-eight million, one hundred seventy-two thousand, five hundred ninety-three".