168338491 has 2 divisors, whose sum is σ = 168338492. Its totient is φ = 168338490.

The previous prime is 168338483. The next prime is 168338503. The reversal of 168338491 is 194833861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168338491 - 2³ = 168338483 is a prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (168338411) 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, 84169245 + 84169246.

It is an arithmetic number, because the mean of its divisors is an integer number (84169246).

Almost surely, 2^168338491 is an apocalyptic number.

168338491 is a deficient number, since it is larger than the sum of its proper divisors (1).

168338491 is an equidigital number, since it uses as much as digits as its factorization.

168338491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 168338491 is about 12974.5324000520. The cubic root of 168338491 is about 552.1551703985.

The spelling of 168338491 in words is "one hundred sixty-eight million, three hundred thirty-eight thousand, four hundred ninety-one".