168311947 has 4 divisors (see below), whose sum is σ = 168341976. Its totient is φ = 168281920.

The previous prime is 168311909. The next prime is 168311959. The reversal of 168311947 is 749113861.

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 168311947 - 2¹¹ = 168309899 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168311987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3829 + ... + 18742.

It is an arithmetic number, because the mean of its divisors is an integer number (42085494).

Almost surely, 2^168311947 is an apocalyptic number.

168311947 is a deficient number, since it is larger than the sum of its proper divisors (30029).

168311947 is an equidigital number, since it uses as much as digits as its factorization.

168311947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30028.

The product of its digits is 36288, while the sum is 40.

The square root of 168311947 is about 12973.5094326863. The cubic root of 168311947 is about 552.1261471744.

The spelling of 168311947 in words is "one hundred sixty-eight million, three hundred eleven thousand, nine hundred forty-seven".