163820173 has 4 divisors (see below), whose sum is σ = 178712928. Its totient is φ = 148927420.

The previous prime is 163820141. The next prime is 163820219. The reversal of 163820173 is 371028361.

163820173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163820173 - 2⁵ = 163820141 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 (163820273) 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, 7446361 + ... + 7446382.

It is an arithmetic number, because the mean of its divisors is an integer number (44678232).

Almost surely, 2^163820173 is an apocalyptic number.

It is an amenable number.

163820173 is a deficient number, since it is larger than the sum of its proper divisors (14892755).

163820173 is a wasteful number, since it uses less digits than its factorization.

163820173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14892754.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 163820173 is about 12799.2254843799. The cubic root of 163820173 is about 547.1702293293.

The spelling of 163820173 in words is "one hundred sixty-three million, eight hundred twenty thousand, one hundred seventy-three".