68912191 has 2 divisors, whose sum is σ = 68912192. Its totient is φ = 68912190.

The previous prime is 68912189. The next prime is 68912197. The reversal of 68912191 is 19121986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68912191 - 2¹ = 68912189 is a prime.

Together with 68912189, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 68912191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68912197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34456095 + 34456096.

It is an arithmetic number, because the mean of its divisors is an integer number (34456096).

Almost surely, 2^68912191 is an apocalyptic number.

68912191 is a deficient number, since it is larger than the sum of its proper divisors (1).

68912191 is an equidigital number, since it uses as much as digits as its factorization.

68912191 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 68912191 is about 8301.3366995924. The cubic root of 68912191 is about 409.9825314786.

It can be divided in two parts, 689 and 12191, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 68912191 in words is "sixty-eight million, nine hundred twelve thousand, one hundred ninety-one".