128209193 has 4 divisors (see below), whose sum is σ = 146524800. Its totient is φ = 109893588.

The previous prime is 128209163. The next prime is 128209201. The reversal of 128209193 is 391902821.

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: 391902821 = 8563 ⋅45767.

It is not a de Polignac number, because 128209193 - 2⁸ = 128208937 is a prime.

It is a super-2 number, since 2×128209193² = 32875194339422498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128209163) 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, 9157793 + ... + 9157806.

It is an arithmetic number, because the mean of its divisors is an integer number (36631200).

Almost surely, 2^128209193 is an apocalyptic number.

It is an amenable number.

128209193 is a deficient number, since it is larger than the sum of its proper divisors (18315607).

128209193 is an equidigital number, since it uses as much as digits as its factorization.

128209193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18315606.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 128209193 is about 11322.9498365046. The cubic root of 128209193 is about 504.2428191353.

The spelling of 128209193 in words is "one hundred twenty-eight million, two hundred nine thousand, one hundred ninety-three".