168916891 has 8 divisors (see below), whose sum is σ = 198447984. Its totient is φ = 141748320.

The previous prime is 168916873. The next prime is 168916907. The reversal of 168916891 is 198619861.

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 168916891 - 2¹¹ = 168914843 is a prime.

168916891 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 (168916841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590476 + ... + 590761.

It is an arithmetic number, because the mean of its divisors is an integer number (24805998).

Almost surely, 2^168916891 is an apocalyptic number.

168916891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

168916891 is a deficient number, since it is larger than the sum of its proper divisors (29531093).

168916891 is a wasteful number, since it uses less digits than its factorization.

168916891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181261.

The product of its digits is 186624, while the sum is 49.

The square root of 168916891 is about 12996.8031069183. The cubic root of 168916891 is about 552.7868371297.

The spelling of 168916891 in words is "one hundred sixty-eight million, nine hundred sixteen thousand, eight hundred ninety-one".