219190809 has 16 divisors (see below), whose sum is σ = 310927680. Its totient is φ = 136872960.

The previous prime is 219190753. The next prime is 219190813. The reversal of 219190809 is 908091912.

It is a happy number.

It is not a de Polignac number, because 219190809 - 2⁹ = 219190297 is a prime.

It is a super-2 number, since 2×219190809² = 96089221500148962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (219190889) 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 15 ways as a sum of consecutive naturals, for example, 577 + ... + 20945.

It is an arithmetic number, because the mean of its divisors is an integer number (19432980).

Almost surely, 2^219190809 is an apocalyptic number.

It is an amenable number.

219190809 is a deficient number, since it is larger than the sum of its proper divisors (91736871).

219190809 is a wasteful number, since it uses less digits than its factorization.

219190809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20600.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 219190809 is about 14805.0940219912. The cubic root of 219190809 is about 602.9400230218.

The spelling of 219190809 in words is "two hundred nineteen million, one hundred ninety thousand, eight hundred nine".