128523173 has 4 divisors (see below), whose sum is σ = 131512128. Its totient is φ = 125534220.

The previous prime is 128523169. The next prime is 128523203. The reversal of 128523173 is 371325821.

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: 371325821 = 37 ⋅10035833.

It is a cyclic number.

It is not a de Polignac number, because 128523173 - 2² = 128523169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128523113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1494413 + ... + 1494498.

It is an arithmetic number, because the mean of its divisors is an integer number (32878032).

Almost surely, 2^128523173 is an apocalyptic number.

It is an amenable number.

128523173 is a deficient number, since it is larger than the sum of its proper divisors (2988955).

128523173 is an equidigital number, since it uses as much as digits as its factorization.

128523173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988954.

The product of its digits is 10080, while the sum is 32.

The square root of 128523173 is about 11336.8061198911. The cubic root of 128523173 is about 504.6541081397.

Adding to 128523173 its reverse (371325821), we get a palindrome (499848994).

The spelling of 128523173 in words is "one hundred twenty-eight million, five hundred twenty-three thousand, one hundred seventy-three".