68391047 has 2 divisors, whose sum is σ = 68391048. Its totient is φ = 68391046.

The previous prime is 68390989. The next prime is 68391049. The reversal of 68391047 is 74019386.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68391047 - 2¹² = 68386951 is a prime.

Together with 68391049, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68391047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68391049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34195523 + 34195524.

It is an arithmetic number, because the mean of its divisors is an integer number (34195524).

Almost surely, 2^68391047 is an apocalyptic number.

68391047 is a deficient number, since it is larger than the sum of its proper divisors (1).

68391047 is an equidigital number, since it uses as much as digits as its factorization.

68391047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 68391047 is about 8269.8879678022. The cubic root of 68391047 is about 408.9464264292.

The spelling of 68391047 in words is "sixty-eight million, three hundred ninety-one thousand, forty-seven".