128191822 has 24 divisors (see below), whose sum is σ = 221403672. Its totient is φ = 55198800.

The previous prime is 128191813. The next prime is 128191829. The reversal of 128191822 is 228191821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128191829) 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 11 ways as a sum of consecutive naturals, for example, 129 + ... + 16012.

It is an arithmetic number, because the mean of its divisors is an integer number (9225153).

Almost surely, 2^128191822 is an apocalyptic number.

128191822 is a deficient number, since it is larger than the sum of its proper divisors (93211850).

128191822 is a wasteful number, since it uses less digits than its factorization.

128191822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16192 (or 16173 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 128191822 is about 11322.1827400904. The cubic root of 128191822 is about 504.2200449036.

Subtracting 128191822 from its reverse (228191821), we obtain a palindrome (99999999).

It can be divided in two parts, 12819 and 1822, that added together give a palindrome (14641).

The spelling of 128191822 in words is "one hundred twenty-eight million, one hundred ninety-one thousand, eight hundred twenty-two".