163903 has 4 divisors (see below), whose sum is σ = 164808. Its totient is φ = 163000.

The previous prime is 163901. The next prime is 163909. The reversal of 163903 is 309361.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 163903 - 2¹ = 163901 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (41202).

2¹⁶³⁹⁰³ is an apocalyptic number.

163903 is a deficient number, since it is larger than the sum of its proper divisors (905).

163903 is an equidigital number, since it uses as much as digits as its factorization.

163903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 163903 is about 404.8493546988. The cubic root of 163903 is about 54.7262429681.

The spelling of 163903 in words is "one hundred sixty-three thousand, nine hundred three".