68108191 has 4 divisors (see below), whose sum is σ = 68970400. Its totient is φ = 67245984.

The previous prime is 68108189. The next prime is 68108203. The reversal of 68108191 is 19180186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19180186 = 2 ⋅9590093.

It is a cyclic number.

It is not a de Polignac number, because 68108191 - 2¹ = 68108189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68108101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430986 + ... + 431143.

It is an arithmetic number, because the mean of its divisors is an integer number (17242600).

Almost surely, 2^68108191 is an apocalyptic number.

68108191 is a deficient number, since it is larger than the sum of its proper divisors (862209).

68108191 is an equidigital number, since it uses as much as digits as its factorization.

68108191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862208.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 68108191 is about 8252.7686869317. The cubic root of 68108191 is about 408.3818652668.

The spelling of 68108191 in words is "sixty-eight million, one hundred eight thousand, one hundred ninety-one".