168069491 has 2 divisors, whose sum is σ = 168069492. Its totient is φ = 168069490.

The previous prime is 168069481. The next prime is 168069511. The reversal of 168069491 is 194960861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168069491 - 2⁶ = 168069427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168069481) 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, 84034745 + 84034746.

It is an arithmetic number, because the mean of its divisors is an integer number (84034746).

Almost surely, 2^168069491 is an apocalyptic number.

168069491 is a deficient number, since it is larger than the sum of its proper divisors (1).

168069491 is an equidigital number, since it uses as much as digits as its factorization.

168069491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 168069491 is about 12964.1617931897. The cubic root of 168069491 is about 551.8609043127.

The spelling of 168069491 in words is "one hundred sixty-eight million, sixty-nine thousand, four hundred ninety-one".