11445209989 has 2 divisors, whose sum is σ = 11445209990. Its totient is φ = 11445209988.

The previous prime is 11445209933. The next prime is 11445210001. The reversal of 11445209989 is 98990254411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6077449764 + 5367760225 = 77958^2 + 73265^2 .

It is an emirp because it is prime and its reverse (98990254411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11445209989 - 2¹¹ = 11445207941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11445209689) 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, 5722604994 + 5722604995.

It is an arithmetic number, because the mean of its divisors is an integer number (5722604995).

Almost surely, 2^11445209989 is an apocalyptic number.

It is an amenable number.

11445209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11445209989 is an equidigital number, since it uses as much as digits as its factorization.

11445209989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 52.

It can be divided in two parts, 11 and 445209989, that added together give a square (445210000 = 21100²).

The spelling of 11445209989 in words is "eleven billion, four hundred forty-five million, two hundred nine thousand, nine hundred eighty-nine".