199543 has 4 divisors (see below), whose sum is σ = 200448. Its totient is φ = 198640.

The previous prime is 199523. The next prime is 199559. The reversal of 199543 is 345991.

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: 345991 = 31 ⋅11161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199543 is a prime.

It is a Duffinian number.

199543 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123 + ... + 643.

It is an arithmetic number, because the mean of its divisors is an integer number (50112).

2¹⁹⁹⁵⁴³ is an apocalyptic number.

199543 is a deficient number, since it is larger than the sum of its proper divisors (905).

199543 is an equidigital number, since it uses as much as digits as its factorization.

199543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

The product of its digits is 4860, while the sum is 31.

The square root of 199543 is about 446.7023617578. The cubic root of 199543 is about 58.4357782577.

The spelling of 199543 in words is "one hundred ninety-nine thousand, five hundred forty-three".