199613 has 4 divisors (see below), whose sum is σ = 200508. Its totient is φ = 198720.

The previous prime is 199603. The next prime is 199621. The reversal of 199613 is 316991.

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 can be written as a sum of positive squares in 2 ways, for example, as 41209 + 158404 = 203^2 + 398^2 .

It is a cyclic number.

It is not a de Polignac number, because 199613 - 2⁸ = 199357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199603) 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, 203 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (50127).

2¹⁹⁹⁶¹³ is an apocalyptic number.

It is an amenable number.

199613 is a deficient number, since it is larger than the sum of its proper divisors (895).

199613 is an equidigital number, since it uses as much as digits as its factorization.

199613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its digits is 1458, while the sum is 29.

The square root of 199613 is about 446.7807068350. The cubic root of 199613 is about 58.4426105800.

The spelling of 199613 in words is "one hundred ninety-nine thousand, six hundred thirteen".