168080891 has 4 divisors (see below), whose sum is σ = 183360984. Its totient is φ = 152800800.

The previous prime is 168080879. The next prime is 168080909. The reversal of 168080891 is 198080861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168080891 is a prime.

168080891 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168080831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7640030 + ... + 7640051.

It is an arithmetic number, because the mean of its divisors is an integer number (45840246).

Almost surely, 2^168080891 is an apocalyptic number.

168080891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

168080891 is a deficient number, since it is larger than the sum of its proper divisors (15280093).

168080891 is a wasteful number, since it uses less digits than its factorization.

168080891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15280092.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 168080891 is about 12964.6014593585. The cubic root of 168080891 is about 551.8733814375.

The spelling of 168080891 in words is "one hundred sixty-eight million, eighty thousand, eight hundred ninety-one".