199218241 has 4 divisors (see below), whose sum is σ = 201947332. Its totient is φ = 196489152.

The previous prime is 199218191. The next prime is 199218247. The reversal of 199218241 is 142812991.

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 126900225 + 72318016 = 11265^2 + 8504^2 .

It is a cyclic number.

It is not a de Polignac number, because 199218241 - 2¹³ = 199210049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199218241.

It is not an unprimeable number, because it can be changed into a prime (199218247) 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, 1364436 + ... + 1364581.

It is an arithmetic number, because the mean of its divisors is an integer number (50486833).

Almost surely, 2^199218241 is an apocalyptic number.

It is an amenable number.

199218241 is a deficient number, since it is larger than the sum of its proper divisors (2729091).

199218241 is an equidigital number, since it uses as much as digits as its factorization.

199218241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729090.

The product of its digits is 10368, while the sum is 37.

The square root of 199218241 is about 14114.4692071647. The cubic root of 199218241 is about 584.0405936395.

The spelling of 199218241 in words is "one hundred ninety-nine million, two hundred eighteen thousand, two hundred forty-one".