199861245 has 12 divisors (see below), whose sum is σ = 346426236. Its totient is φ = 106592640.

The previous prime is 199861241. The next prime is 199861267. The reversal of 199861245 is 542168991.

It can be written as a sum of positive squares in 2 ways, for example, as 23794884 + 176066361 = 4878^2 + 13269^2 .

It is not a de Polignac number, because 199861245 - 2² = 199861241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4441361 = 199861245 / (1 + 9 + 9 + 8 + 6 + 1 + 2 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 199861245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199861241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2220636 + ... + 2220725.

It is an arithmetic number, because the mean of its divisors is an integer number (28868853).

Almost surely, 2^199861245 is an apocalyptic number.

199861245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199861245 is a deficient number, since it is larger than the sum of its proper divisors (146564991).

199861245 is a wasteful number, since it uses less digits than its factorization.

199861245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441372 (or 4441369 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 199861245 is about 14137.2290424963. The cubic root of 199861245 is about 584.6682756612.

The spelling of 199861245 in words is "one hundred ninety-nine million, eight hundred sixty-one thousand, two hundred forty-five".