219806523913 has 2 divisors, whose sum is σ = 219806523914. Its totient is φ = 219806523912.

The previous prime is 219806523907. The next prime is 219806523973. The reversal of 219806523913 is 319325608912.

219806523913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175132206144 + 44674317769 = 418488^2 + 211363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219806523913 is a prime.

It is not a weakly prime, because it can be changed into another prime (219806523973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109903261956 + 109903261957.

It is an arithmetic number, because the mean of its divisors is an integer number (109903261957).

Almost surely, 2^219806523913 is an apocalyptic number.

It is an amenable number.

219806523913 is a deficient number, since it is larger than the sum of its proper divisors (1).

219806523913 is an equidigital number, since it uses as much as digits as its factorization.

219806523913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 219806523913 in words is "two hundred nineteen billion, eight hundred six million, five hundred twenty-three thousand, nine hundred thirteen".