168005091 has 8 divisors (see below), whose sum is σ = 231731280. Its totient is φ = 108141152.

The previous prime is 168005083. The next prime is 168005107. The reversal of 168005091 is 190500861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168005091 - 2³ = 168005083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168005021) 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 in 7 ways as a sum of consecutive naturals, for example, 965460 + ... + 965633.

It is an arithmetic number, because the mean of its divisors is an integer number (28966410).

Almost surely, 2^168005091 is an apocalyptic number.

168005091 is a deficient number, since it is larger than the sum of its proper divisors (63726189).

168005091 is a wasteful number, since it uses less digits than its factorization.

168005091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931125.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 168005091 is about 12961.6777849166. The cubic root of 168005091 is about 551.7904089036.

The spelling of 168005091 in words is "one hundred sixty-eight million, five thousand, ninety-one".