222911809 has 2 divisors, whose sum is σ = 222911810. Its totient is φ = 222911808.

The previous prime is 222911807. The next prime is 222911831. The reversal of 222911809 is 908119222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150185025 + 72726784 = 12255^2 + 8528^2 .

It is a cyclic number.

It is not a de Polignac number, because 222911809 - 2¹ = 222911807 is a prime.

Together with 222911807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (222911807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111455904 + 111455905.

It is an arithmetic number, because the mean of its divisors is an integer number (111455905).

Almost surely, 2^222911809 is an apocalyptic number.

It is an amenable number.

222911809 is a deficient number, since it is larger than the sum of its proper divisors (1).

222911809 is an equidigital number, since it uses as much as digits as its factorization.

222911809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 222911809 is about 14930.2313779794. The cubic root of 222911809 is about 606.3327484881.

The spelling of 222911809 in words is "two hundred twenty-two million, nine hundred eleven thousand, eight hundred nine".