68291191 has 2 divisors, whose sum is σ = 68291192. Its totient is φ = 68291190.

The previous prime is 68291183. The next prime is 68291207. The reversal of 68291191 is 19119286.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68291191 - 2³ = 68291183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68291191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68291131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34145595 + 34145596.

It is an arithmetic number, because the mean of its divisors is an integer number (34145596).

Almost surely, 2^68291191 is an apocalyptic number.

68291191 is a deficient number, since it is larger than the sum of its proper divisors (1).

68291191 is an equidigital number, since it uses as much as digits as its factorization.

68291191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 37.

The square root of 68291191 is about 8263.8484376228. The cubic root of 68291191 is about 408.7472987817.

The spelling of 68291191 in words is "sixty-eight million, two hundred ninety-one thousand, one hundred ninety-one".