219800009 has 16 divisors (see below), whose sum is σ = 260381184. Its totient is φ = 184433040.

The previous prime is 219800003. The next prime is 219800011. The reversal of 219800009 is 900008912.

219800009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 219800009 - 2²⁰ = 218751433 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (219800003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10952 + ... + 23654.

It is an arithmetic number, because the mean of its divisors is an integer number (16273824).

Almost surely, 2^219800009 is an apocalyptic number.

It is an amenable number.

219800009 is a deficient number, since it is larger than the sum of its proper divisors (40581175).

219800009 is a wasteful number, since it uses less digits than its factorization.

219800009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12749 (or 12727 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 219800009 is about 14825.6537461253. The cubic root of 219800009 is about 603.4980927956.

The spelling of 219800009 in words is "two hundred nineteen million, eight hundred thousand, nine".