168911971 has 2 divisors, whose sum is σ = 168911972. Its totient is φ = 168911970.

The previous prime is 168911947. The next prime is 168912011. The reversal of 168911971 is 179119861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168911971 - 2⁹ = 168911459 is a prime.

It is not a weakly prime, because it can be changed into another prime (168911671) 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, 84455985 + 84455986.

It is an arithmetic number, because the mean of its divisors is an integer number (84455986).

Almost surely, 2^168911971 is an apocalyptic number.

168911971 is a deficient number, since it is larger than the sum of its proper divisors (1).

168911971 is an equidigital number, since it uses as much as digits as its factorization.

168911971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 43.

The square root of 168911971 is about 12996.6138282246. The cubic root of 168911971 is about 552.7814701163.

The spelling of 168911971 in words is "one hundred sixty-eight million, nine hundred eleven thousand, nine hundred seventy-one".