199999613 has 4 divisors (see below), whose sum is σ = 218181408. Its totient is φ = 181817820.

The previous prime is 199999609. The next prime is 199999649. The reversal of 199999613 is 316999991.

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 199999613 - 2² = 199999609 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 (199999673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9090881 + ... + 9090902.

It is an arithmetic number, because the mean of its divisors is an integer number (54545352).

Almost surely, 2^199999613 is an apocalyptic number.

It is an amenable number.

199999613 is a deficient number, since it is larger than the sum of its proper divisors (18181795).

199999613 is a wasteful number, since it uses less digits than its factorization.

199999613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18181794.

The product of its digits is 1062882, while the sum is 56.

The square root of 199999613 is about 14142.1219412081. The cubic root of 199999613 is about 584.8031704440.

The spelling of 199999613 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred thirteen".