163643 has 2 divisors, whose sum is σ = 163644. Its totient is φ = 163642.

The previous prime is 163637. The next prime is 163661. The reversal of 163643 is 346361.

It is a weak prime.

It is an emirp because it is prime and its reverse (346361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163643 - 2⁴ = 163627 is a prime.

It is not a weakly prime, because it can be changed into another prime (163613) 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, 81821 + 81822.

It is an arithmetic number, because the mean of its divisors is an integer number (81822).

2¹⁶³⁶⁴³ is an apocalyptic number.

163643 is a deficient number, since it is larger than the sum of its proper divisors (1).

163643 is an equidigital number, since it uses as much as digits as its factorization.

163643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 163643 is about 404.5281201598. The cubic root of 163643 is about 54.6972901656.

The spelling of 163643 in words is "one hundred sixty-three thousand, six hundred forty-three".