199481109 has 4 divisors (see below), whose sum is σ = 265974816. Its totient is φ = 132987404.

The previous prime is 199481089. The next prime is 199481119. The reversal of 199481109 is 901184991.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-199481109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199481119) 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, 33246849 + ... + 33246854.

It is an arithmetic number, because the mean of its divisors is an integer number (66493704).

Almost surely, 2^199481109 is an apocalyptic number.

It is an amenable number.

199481109 is a deficient number, since it is larger than the sum of its proper divisors (66493707).

199481109 is an equidigital number, since it uses as much as digits as its factorization.

199481109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66493706.

The product of its (nonzero) digits is 23328, while the sum is 42.

The square root of 199481109 is about 14123.7781418429. The cubic root of 199481109 is about 584.2973608008.

The spelling of 199481109 in words is "one hundred ninety-nine million, four hundred eighty-one thousand, one hundred nine".