12291089 has 2 divisors, whose sum is σ = 12291090. Its totient is φ = 12291088.

The previous prime is 12291079. The next prime is 12291101. The reversal of 12291089 is 98019221.

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., 11444689 + 846400 = 3383^2 + 920^2 .

It is an emirp because it is prime and its reverse (98019221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12291089 - 2⁸ = 12290833 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12291029) 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, 6145544 + 6145545.

It is an arithmetic number, because the mean of its divisors is an integer number (6145545).

Almost surely, 2^12291089 is an apocalyptic number.

It is an amenable number.

12291089 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291089 is an equidigital number, since it uses as much as digits as its factorization.

12291089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12291089 is about 3505.8649432059. The cubic root of 12291089 is about 230.7792660394.

The spelling of 12291089 in words is "twelve million, two hundred ninety-one thousand, eighty-nine".