2222211809 has 2 divisors, whose sum is σ = 2222211810. Its totient is φ = 2222211808.

The previous prime is 2222211793. The next prime is 2222211839. The reversal of 2222211809 is 9081122222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1778477584 + 443734225 = 42172^2 + 21065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222211809 - 2⁴ = 2222211793 is a prime.

It is not a weakly prime, because it can be changed into another prime (2222211839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111105904 + 1111105905.

It is an arithmetic number, because the mean of its divisors is an integer number (1111105905).

Almost surely, 2^2222211809 is an apocalyptic number.

It is an amenable number.

2222211809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222211809 is an equidigital number, since it uses as much as digits as its factorization.

2222211809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 2222211809 is about 47140.3416300731. The cubic root of 2222211809 is about 1304.9538420671.

The spelling of 2222211809 in words is "two billion, two hundred twenty-two million, two hundred eleven thousand, eight hundred nine".