168318949 has 8 divisors (see below), whose sum is σ = 169409880. Its totient is φ = 167232000.

The previous prime is 168318907. The next prime is 168318971. The reversal of 168318949 is 949813861.

It can be written as a sum of positive squares in 4 ways, for example, as 20088324 + 148230625 = 4482^2 + 12175^2 .

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 168318949 - 2²³ = 159930341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168318149) 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 7 ways as a sum of consecutive naturals, for example, 139549 + ... + 140749.

It is an arithmetic number, because the mean of its divisors is an integer number (21176235).

Almost surely, 2^168318949 is an apocalyptic number.

It is an amenable number.

168318949 is a deficient number, since it is larger than the sum of its proper divisors (1090931).

168318949 is a wasteful number, since it uses less digits than its factorization.

168318949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991.

The product of its digits is 373248, while the sum is 49.

The square root of 168318949 is about 12973.7792874706. The cubic root of 168318949 is about 552.1338034613.

The spelling of 168318949 in words is "one hundred sixty-eight million, three hundred eighteen thousand, nine hundred forty-nine".