191108 has 6 divisors (see below), whose sum is σ = 334446. Its totient is φ = 95552.

The previous prime is 191099. The next prime is 191119. The reversal of 191108 is 801191.

It can be written as a sum of positive squares in only one way, i.e., 174724 + 16384 = 418^2 + 128^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 191108.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23885 + ... + 23892.

It is an arithmetic number, because the mean of its divisors is an integer number (55741).

2¹⁹¹¹⁰⁸ is an apocalyptic number.

It is an amenable number.

191108 is a deficient number, since it is larger than the sum of its proper divisors (143338).

191108 is a wasteful number, since it uses less digits than its factorization.

191108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47781 (or 47779 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 191108 is about 437.1590099723. The cubic root of 191108 is about 57.6005047538.

Adding to 191108 its reverse (801191), we get a palindrome (992299).

The spelling of 191108 in words is "one hundred ninety-one thousand, one hundred eight".