219449109 has 24 divisors (see below), whose sum is σ = 330329440. Its totient is φ = 129396960.

The previous prime is 219449099. The next prime is 219449117. The reversal of 219449109 is 901944912.

It is not a de Polignac number, because 219449109 - 2⁷ = 219448981 is a prime.

It is a super-2 number, since 2×219449109² = 96315822881787762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219449129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5262 + ... + 21600.

Almost surely, 2^219449109 is an apocalyptic number.

It is an amenable number.

219449109 is a deficient number, since it is larger than the sum of its proper divisors (110880331).

219449109 is a wasteful number, since it uses less digits than its factorization.

219449109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16401 (or 16390 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 219449109 is about 14813.8148024066. The cubic root of 219449109 is about 603.1767699805.

The spelling of 219449109 in words is "two hundred nineteen million, four hundred forty-nine thousand, one hundred nine".