128787193 has 4 divisors (see below), whose sum is σ = 131782288. Its totient is φ = 125792100.

The previous prime is 128787161. The next prime is 128787203. The reversal of 128787193 is 391787821.

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: 391787821 = 4241 ⋅92381.

It is a cyclic number.

It is not a de Polignac number, because 128787193 - 2⁵ = 128787161 is a prime.

It is a super-2 number, since 2×128787193² = 33172282161638498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128787103) 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, 1497483 + ... + 1497568.

It is an arithmetic number, because the mean of its divisors is an integer number (32945572).

Almost surely, 2^128787193 is an apocalyptic number.

It is an amenable number.

128787193 is a deficient number, since it is larger than the sum of its proper divisors (2995095).

128787193 is an equidigital number, since it uses as much as digits as its factorization.

128787193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995094.

The product of its digits is 169344, while the sum is 46.

The square root of 128787193 is about 11348.4445189638. Note that the first 3 decimals coincide. The cubic root of 128787193 is about 504.9994353488. Note that the first 3 decimals are identical.

The spelling of 128787193 in words is "one hundred twenty-eight million, seven hundred eighty-seven thousand, one hundred ninety-three".