199513909 has 4 divisors (see below), whose sum is σ = 228015904. Its totient is φ = 171011916.

The previous prime is 199513907. The next prime is 199513933. The reversal of 199513909 is 909315991.

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 199513909 - 2¹ = 199513907 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 (199513901) 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, 14250987 + ... + 14251000.

It is an arithmetic number, because the mean of its divisors is an integer number (57003976).

Almost surely, 2^199513909 is an apocalyptic number.

It is an amenable number.

199513909 is a deficient number, since it is larger than the sum of its proper divisors (28501995).

199513909 is an equidigital number, since it uses as much as digits as its factorization.

199513909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28501994.

The product of its (nonzero) digits is 98415, while the sum is 46.

The square root of 199513909 is about 14124.9392565066. The cubic root of 199513909 is about 584.3293837214.

The spelling of 199513909 in words is "one hundred ninety-nine million, five hundred thirteen thousand, nine hundred nine".