163989817 has 8 divisors (see below), whose sum is σ = 173249600. Its totient is φ = 154792944.

The previous prime is 163989799. The next prime is 163989821. The reversal of 163989817 is 718989361.

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 a de Polignac number, because none of the positive numbers 2^k-163989817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163989857) 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, 10317 + ... + 20842.

It is an arithmetic number, because the mean of its divisors is an integer number (21656200).

Almost surely, 2^163989817 is an apocalyptic number.

It is an amenable number.

163989817 is a deficient number, since it is larger than the sum of its proper divisors (9259783).

163989817 is a wasteful number, since it uses less digits than its factorization.

163989817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31455.

The product of its digits is 653184, while the sum is 52.

The square root of 163989817 is about 12805.8508893396. The cubic root of 163989817 is about 547.3590382363.

The spelling of 163989817 in words is "one hundred sixty-three million, nine hundred eighty-nine thousand, eight hundred seventeen".