163989677 has 2 divisors, whose sum is σ = 163989678. Its totient is φ = 163989676.

The previous prime is 163989671. The next prime is 163989691. The reversal of 163989677 is 776989361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101989801 + 61999876 = 10099^2 + 7874^2 .

It is an emirp because it is prime and its reverse (776989361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163989677 - 2⁶ = 163989613 is a prime.

It is a super-3 number, since 3×163989677³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163989671) 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 as a sum of consecutive naturals, namely, 81994838 + 81994839.

It is an arithmetic number, because the mean of its divisors is an integer number (81994839).

Almost surely, 2^163989677 is an apocalyptic number.

It is an amenable number.

163989677 is a deficient number, since it is larger than the sum of its proper divisors (1).

163989677 is an equidigital number, since it uses as much as digits as its factorization.

163989677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 56.

The square root of 163989677 is about 12805.8454230871. The cubic root of 163989677 is about 547.3588824740.

The spelling of 163989677 in words is "one hundred sixty-three million, nine hundred eighty-nine thousand, six hundred seventy-seven".