168681923 has 4 divisors (see below), whose sum is σ = 168910920. Its totient is φ = 168452928.

The previous prime is 168681917. The next prime is 168681941. The reversal of 168681923 is 329186861.

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 168681923 - 2⁴ = 168681907 is a prime.

It is a super-2 number, since 2×168681923² = 56907182293955858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168681983) 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 3 ways as a sum of consecutive naturals, for example, 113390 + ... + 114867.

It is an arithmetic number, because the mean of its divisors is an integer number (42227730).

Almost surely, 2^168681923 is an apocalyptic number.

168681923 is a deficient number, since it is larger than the sum of its proper divisors (228997).

168681923 is an equidigital number, since it uses as much as digits as its factorization.

168681923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228996.

The product of its digits is 124416, while the sum is 44.

The square root of 168681923 is about 12987.7605074932. The cubic root of 168681923 is about 552.5304043381.

The spelling of 168681923 in words is "one hundred sixty-eight million, six hundred eighty-one thousand, nine hundred twenty-three".