168243791 has 2 divisors, whose sum is σ = 168243792. Its totient is φ = 168243790.

The previous prime is 168243769. The next prime is 168243799. The reversal of 168243791 is 197342861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168243791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168243799) 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, 84121895 + 84121896.

It is an arithmetic number, because the mean of its divisors is an integer number (84121896).

Almost surely, 2^168243791 is an apocalyptic number.

168243791 is a deficient number, since it is larger than the sum of its proper divisors (1).

168243791 is an equidigital number, since it uses as much as digits as its factorization.

168243791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 168243791 is about 12970.8824295034. The cubic root of 168243791 is about 552.0516113876.

The spelling of 168243791 in words is "one hundred sixty-eight million, two hundred forty-three thousand, seven hundred ninety-one".