128825191 has 6 divisors (see below), whose sum is σ = 141601376. Its totient is φ = 117113700.

The previous prime is 128825183. The next prime is 128825227. The reversal of 128825191 is 191528821.

It is not a de Polignac number, because 128825191 - 2³ = 128825183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128825191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128825131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 532215 + ... + 532456.

Almost surely, 2^128825191 is an apocalyptic number.

128825191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128825191 is a deficient number, since it is larger than the sum of its proper divisors (12776185).

128825191 is a wasteful number, since it uses less digits than its factorization.

128825191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064693 (or 1064682 counting only the distinct ones).

The product of its digits is 11520, while the sum is 37.

The square root of 128825191 is about 11350.1185456364. The cubic root of 128825191 is about 505.0490962952.

The spelling of 128825191 in words is "one hundred twenty-eight million, eight hundred twenty-five thousand, one hundred ninety-one".