199550945 has 8 divisors (see below), whose sum is σ = 261230400. Its totient is φ = 145127920.

The previous prime is 199550927. The next prime is 199550951. The reversal of 199550945 is 549055991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199550945 - 2²⁶ = 132442081 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199550945.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1814045 + ... + 1814154.

It is an arithmetic number, because the mean of its divisors is an integer number (32653800).

Almost surely, 2^199550945 is an apocalyptic number.

It is an amenable number.

199550945 is a deficient number, since it is larger than the sum of its proper divisors (61679455).

199550945 is a wasteful number, since it uses less digits than its factorization.

199550945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628215.

The product of its (nonzero) digits is 364500, while the sum is 47.

The square root of 199550945 is about 14126.2502101584. The cubic root of 199550945 is about 584.3655380664.

The spelling of 199550945 in words is "one hundred ninety-nine million, five hundred fifty thousand, nine hundred forty-five".