118128173 has 4 divisors (see below), whose sum is σ = 119551488. Its totient is φ = 116704860.

The previous prime is 118128163. The next prime is 118128221. The reversal of 118128173 is 371821811.

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: 371821811 = 19 ⋅19569569.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118128173 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 (118128163) 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, 711533 + ... + 711698.

It is an arithmetic number, because the mean of its divisors is an integer number (29887872).

Almost surely, 2^118128173 is an apocalyptic number.

It is an amenable number.

118128173 is a deficient number, since it is larger than the sum of its proper divisors (1423315).

118128173 is an equidigital number, since it uses as much as digits as its factorization.

118128173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423314.

The product of its digits is 2688, while the sum is 32.

The square root of 118128173 is about 10868.6785305298. The cubic root of 118128173 is about 490.6643397560.

Adding to 118128173 its reverse (371821811), we get a palindrome (489949984).

The spelling of 118128173 in words is "one hundred eighteen million, one hundred twenty-eight thousand, one hundred seventy-three".