168891613 has 8 divisors (see below), whose sum is σ = 184450176. Its totient is φ = 153367200.

The previous prime is 168891607. The next prime is 168891623. The reversal of 168891613 is 316198861.

It is a happy number.

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 168891613 - 2⁵ = 168891581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168891613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168891623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2428 + ... + 18538.

It is an arithmetic number, because the mean of its divisors is an integer number (23056272).

Almost surely, 2^168891613 is an apocalyptic number.

It is an amenable number.

168891613 is a deficient number, since it is larger than the sum of its proper divisors (15558563).

168891613 is a wasteful number, since it uses less digits than its factorization.

168891613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17075.

The product of its digits is 62208, while the sum is 43.

The square root of 168891613 is about 12995.8306006196. The cubic root of 168891613 is about 552.7592613543.

The spelling of 168891613 in words is "one hundred sixty-eight million, eight hundred ninety-one thousand, six hundred thirteen".