168224913 has 6 divisors (see below), whose sum is σ = 242991554. Its totient is φ = 112149936.

The previous prime is 168224909. The next prime is 168224929. The reversal of 168224913 is 319422861.

168224913 is a `hidden beast` number, since 168 + 2 + 2 + 491 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135769104 + 32455809 = 11652^2 + 5697^2 .

It is not a de Polignac number, because 168224913 - 2² = 168224909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161224913) 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 5 ways as a sum of consecutive naturals, for example, 9345820 + ... + 9345837.

Almost surely, 2^168224913 is an apocalyptic number.

It is an amenable number.

168224913 is a deficient number, since it is larger than the sum of its proper divisors (74766641).

168224913 is a wasteful number, since it uses less digits than its factorization.

168224913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18691663 (or 18691660 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 168224913 is about 12970.1547022385. The cubic root of 168224913 is about 552.0309627402.

The spelling of 168224913 in words is "one hundred sixty-eight million, two hundred twenty-four thousand, nine hundred thirteen".