191008 has 24 divisors (see below), whose sum is σ = 387072. Its totient is φ = 92736.

The previous prime is 190997. The next prime is 191021. The reversal of 191008 is 800191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441 + ... + 1567.

It is an arithmetic number, because the mean of its divisors is an integer number (16128).

2¹⁹¹⁰⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193536).

191008 is an abundant number, since it is smaller than the sum of its proper divisors (196064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191008 is a wasteful number, since it uses less digits than its factorization.

191008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 191008 is about 437.0446201476. The cubic root of 191008 is about 57.5904562377.

Adding to 191008 its reverse (800191), we get a palindrome (991199).

The spelling of 191008 in words is "one hundred ninety-one thousand, eight".