219194009 has 4 divisors (see below), whose sum is σ = 219908304. Its totient is φ = 218479716.

The previous prime is 219193993. The next prime is 219194011. The reversal of 219194009 is 900491912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 219194009 - 2⁴ = 219193993 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 219194009.

It is not an unprimeable number, because it can be changed into a prime (219194029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356687 + ... + 357300.

It is an arithmetic number, because the mean of its divisors is an integer number (54977076).

Almost surely, 2^219194009 is an apocalyptic number.

It is an amenable number.

219194009 is a deficient number, since it is larger than the sum of its proper divisors (714295).

219194009 is an equidigital number, since it uses as much as digits as its factorization.

219194009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714294.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 219194009 is about 14805.2020925079. The cubic root of 219194009 is about 602.9429571453.

The spelling of 219194009 in words is "two hundred nineteen million, one hundred ninety-four thousand, nine".