219594028909 has 2 divisors, whose sum is σ = 219594028910. Its totient is φ = 219594028908.

The previous prime is 219594028903. The next prime is 219594028963. The reversal of 219594028909 is 909820495912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188705966409 + 30888062500 = 434403^2 + 175750^2 .

It is a cyclic number.

It is not a de Polignac number, because 219594028909 - 2⁵ = 219594028877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219594028903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109797014454 + 109797014455.

It is an arithmetic number, because the mean of its divisors is an integer number (109797014455).

Almost surely, 2^219594028909 is an apocalyptic number.

It is an amenable number.

219594028909 is a deficient number, since it is larger than the sum of its proper divisors (1).

219594028909 is an equidigital number, since it uses as much as digits as its factorization.

219594028909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 219594028909 in words is "two hundred nineteen billion, five hundred ninety-four million, twenty-eight thousand, nine hundred nine".