19999163 has 4 divisors (see below), whose sum is σ = 20010048. Its totient is φ = 19988280.

The previous prime is 19999159. The next prime is 19999193. The reversal of 19999163 is 36199991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 36199991 = 3089 ⋅11719.

It is a cyclic number.

It is not a de Polignac number, because 19999163 - 2² = 19999159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999193) 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, 1931 + ... + 6612.

It is an arithmetic number, because the mean of its divisors is an integer number (5002512).

Almost surely, 2^19999163 is an apocalyptic number.

19999163 is a deficient number, since it is larger than the sum of its proper divisors (10885).

19999163 is an equidigital number, since it uses as much as digits as its factorization.

19999163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884.

The product of its digits is 118098, while the sum is 47.

The square root of 19999163 is about 4472.0423745756. The cubic root of 19999163 is about 271.4379749941.

The spelling of 19999163 in words is "nineteen million, nine hundred ninety-nine thousand, one hundred sixty-three".