1022111809 has 2 divisors, whose sum is σ = 1022111810. Its totient is φ = 1022111808.

The previous prime is 1022111807. The next prime is 1022111843. The reversal of 1022111809 is 9081112201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013021584 + 9090225 = 31828^2 + 3015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022111809 - 2¹ = 1022111807 is a prime.

Together with 1022111807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1022111801) 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, 511055904 + 511055905.

It is an arithmetic number, because the mean of its divisors is an integer number (511055905).

Almost surely, 2^1022111809 is an apocalyptic number.

It is an amenable number.

1022111809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022111809 is an equidigital number, since it uses as much as digits as its factorization.

1022111809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1022111809 is about 31970.4834026638. The cubic root of 1022111809 is about 1007.3169348870.

The spelling of 1022111809 in words is "one billion, twenty-two million, one hundred eleven thousand, eight hundred nine".