219808811 has 2 divisors, whose sum is σ = 219808812. Its totient is φ = 219808810.

The previous prime is 219808781. The next prime is 219808837. The reversal of 219808811 is 118808912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 219808811 - 2⁶ = 219808747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (219808871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109904405 + 109904406.

It is an arithmetic number, because the mean of its divisors is an integer number (109904406).

Almost surely, 2^219808811 is an apocalyptic number.

219808811 is a deficient number, since it is larger than the sum of its proper divisors (1).

219808811 is an equidigital number, since it uses as much as digits as its factorization.

219808811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 38.

The square root of 219808811 is about 14825.9505934695. The cubic root of 219808811 is about 603.5061484812.

The spelling of 219808811 in words is "two hundred nineteen million, eight hundred eight thousand, eight hundred eleven".