168606749 has 4 divisors (see below), whose sum is σ = 169538460. Its totient is φ = 167675040.

The previous prime is 168606701. The next prime is 168606787. The reversal of 168606749 is 947606861.

It is a happy number.

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 4305625 + 164301124 = 2075^2 + 12818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168606749 is a prime.

It is a super-3 number, since 3×168606749³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168606049) 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, 465584 + ... + 465945.

It is an arithmetic number, because the mean of its divisors is an integer number (42384615).

Almost surely, 2^168606749 is an apocalyptic number.

It is an amenable number.

168606749 is a deficient number, since it is larger than the sum of its proper divisors (931711).

168606749 is an equidigital number, since it uses as much as digits as its factorization.

168606749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931710.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 168606749 is about 12984.8661525639. The cubic root of 168606749 is about 552.4483127667.

The spelling of 168606749 in words is "one hundred sixty-eight million, six hundred six thousand, seven hundred forty-nine".