168731113 has 4 divisors (see below), whose sum is σ = 172846548. Its totient is φ = 164615680.

The previous prime is 168731083. The next prime is 168731117. The reversal of 168731113 is 311137861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12306064 + 156425049 = 3508^2 + 12507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168731113 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (168731117) 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, 2057656 + ... + 2057737.

It is an arithmetic number, because the mean of its divisors is an integer number (43211637).

Almost surely, 2^168731113 is an apocalyptic number.

It is an amenable number.

168731113 is a deficient number, since it is larger than the sum of its proper divisors (4115435).

168731113 is an equidigital number, since it uses as much as digits as its factorization.

168731113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115434.

The product of its digits is 3024, while the sum is 31.

The square root of 168731113 is about 12989.6540754556. The cubic root of 168731113 is about 552.5841076408.

Adding to 168731113 its reverse (311137861), we get a palindrome (479868974).

The spelling of 168731113 in words is "one hundred sixty-eight million, seven hundred thirty-one thousand, one hundred thirteen".