168683891 has 4 divisors (see below), whose sum is σ = 171543000. Its totient is φ = 165824784.

The previous prime is 168683887. The next prime is 168683903. The reversal of 168683891 is 198386861.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 168683891 - 2² = 168683887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168683831) 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, 1429466 + ... + 1429583.

It is an arithmetic number, because the mean of its divisors is an integer number (42885750).

Almost surely, 2^168683891 is an apocalyptic number.

168683891 is a deficient number, since it is larger than the sum of its proper divisors (2859109).

168683891 is an equidigital number, since it uses as much as digits as its factorization.

168683891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859108.

The product of its digits is 497664, while the sum is 50.

The square root of 168683891 is about 12987.8362709113. The cubic root of 168683891 is about 552.5325531074.

The spelling of 168683891 in words is "one hundred sixty-eight million, six hundred eighty-three thousand, eight hundred ninety-one".