219238438709 has 2 divisors, whose sum is σ = 219238438710. Its totient is φ = 219238438708.

The previous prime is 219238438691. The next prime is 219238438723. The reversal of 219238438709 is 907834832912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219000600625 + 237838084 = 467975^2 + 15422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219238438709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219238438409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109619219354 + 109619219355.

It is an arithmetic number, because the mean of its divisors is an integer number (109619219355).

Almost surely, 2^219238438709 is an apocalyptic number.

It is an amenable number.

219238438709 is a deficient number, since it is larger than the sum of its proper divisors (1).

219238438709 is an equidigital number, since it uses as much as digits as its factorization.

219238438709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 219238438709 in words is "two hundred nineteen billion, two hundred thirty-eight million, four hundred thirty-eight thousand, seven hundred nine".