199913365 has 4 divisors (see below), whose sum is σ = 239896044. Its totient is φ = 159930688.

The previous prime is 199913359. The next prime is 199913369. The reversal of 199913365 is 563319991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563319991 = 13 ⋅43332307.

It can be written as a sum of positive squares in 2 ways, for example, as 35509681 + 164403684 = 5959^2 + 12822^2 .

It is a cyclic number.

It is not a de Polignac number, because 199913365 - 2⁵ = 199913333 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 (199913369) 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, 19991332 + ... + 19991341.

It is an arithmetic number, because the mean of its divisors is an integer number (59974011).

Almost surely, 2^199913365 is an apocalyptic number.

It is an amenable number.

199913365 is a deficient number, since it is larger than the sum of its proper divisors (39982679).

199913365 is an equidigital number, since it uses as much as digits as its factorization.

199913365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39982678.

The product of its digits is 196830, while the sum is 46.

The square root of 199913365 is about 14139.0722821549. The cubic root of 199913365 is about 584.7190946882.

The spelling of 199913365 in words is "one hundred ninety-nine million, nine hundred thirteen thousand, three hundred sixty-five".