163391 has 4 divisors (see below), whose sum is σ = 165000. Its totient is φ = 161784.

The previous prime is 163367. The next prime is 163393. The reversal of 163391 is 193361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163391 - 2⁶ = 163327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163393) 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 3 ways as a sum of consecutive naturals, for example, 641 + ... + 858.

It is an arithmetic number, because the mean of its divisors is an integer number (41250).

2¹⁶³³⁹¹ is an apocalyptic number.

163391 is a deficient number, since it is larger than the sum of its proper divisors (1609).

163391 is a wasteful number, since it uses less digits than its factorization.

163391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its digits is 486, while the sum is 23.

The square root of 163391 is about 404.2165261342. The cubic root of 163391 is about 54.6691989375.

The spelling of 163391 in words is "one hundred sixty-three thousand, three hundred ninety-one".