219409049 has 4 divisors (see below), whose sum is σ = 221350836. Its totient is φ = 217467264.

The previous prime is 219409039. The next prime is 219409061. The reversal of 219409049 is 940904912.

It is a happy number.

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 104919049 + 114490000 = 10243^2 + 10700^2 .

It is a cyclic number.

It is not a de Polignac number, because 219409049 - 2⁴ = 219409033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (219409039) 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, 970724 + ... + 970949.

It is an arithmetic number, because the mean of its divisors is an integer number (55337709).

Almost surely, 2^219409049 is an apocalyptic number.

It is an amenable number.

219409049 is a deficient number, since it is larger than the sum of its proper divisors (1941787).

219409049 is a wasteful number, since it uses less digits than its factorization.

219409049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941786.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 219409049 is about 14812.4626244254. The cubic root of 219409049 is about 603.1400648389.

The spelling of 219409049 in words is "two hundred nineteen million, four hundred nine thousand, forty-nine".