199049645 has 4 divisors (see below), whose sum is σ = 238859580. Its totient is φ = 159239712.

The previous prime is 199049633. The next prime is 199049647. The reversal of 199049645 is 546940991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35772361 + 163277284 = 5981^2 + 12778^2 .

It is a cyclic number.

It is not a de Polignac number, because 199049645 - 2¹⁰ = 199048621 is a prime.

It is a super-3 number, since 3×199049645³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 199049645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199049647) 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, 19904960 + ... + 19904969.

It is an arithmetic number, because the mean of its divisors is an integer number (59714895).

Almost surely, 2^199049645 is an apocalyptic number.

It is an amenable number.

199049645 is a deficient number, since it is larger than the sum of its proper divisors (39809935).

199049645 is an equidigital number, since it uses as much as digits as its factorization.

199049645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39809934.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 199049645 is about 14108.4954903065. The cubic root of 199049645 is about 583.8757916320.

The spelling of 199049645 in words is "one hundred ninety-nine million, forty-nine thousand, six hundred forty-five".