219073610809 has 9 divisors (see below), whose sum is σ = 222752887149. Its totient is φ = 215454156960.

The previous prime is 219073610807. The next prime is 219073610849. The reversal of 219073610809 is 908016370912.

It is a happy number.

The square root of 219073610809 is 468053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 44827475625 + 174246135184 = 211725^2 + 417428^2 .

It is not a de Polignac number, because 219073610809 - 2¹ = 219073610807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (219073610807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 28547397 + ... + 28555069.

Almost surely, 2^219073610809 is an apocalyptic number.

219073610809 is the 468053-rd square number.

219073610809 is the 234027-th centered octagonal number.

It is an amenable number.

219073610809 is a deficient number, since it is larger than the sum of its proper divisors (3679276340).

219073610809 is an frugal number, since it uses more digits than its factorization.

219073610809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15468 (or 7734 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 219073610809 in words is "two hundred nineteen billion, seventy-three million, six hundred ten thousand, eight hundred nine".