11990989 has 2 divisors, whose sum is σ = 11990990. Its totient is φ = 11990988.

The previous prime is 11990987. The next prime is 11990999. The reversal of 11990989 is 98909911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6086089 + 5904900 = 2467^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 11990989 - 2¹ = 11990987 is a prime.

Together with 11990987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11990987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5995494 + 5995495.

It is an arithmetic number, because the mean of its divisors is an integer number (5995495).

Almost surely, 2^11990989 is an apocalyptic number.

It is an amenable number.

11990989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11990989 is an equidigital number, since it uses as much as digits as its factorization.

11990989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 11990989 is about 3462.8007450617. The cubic root of 11990989 is about 228.8855284939.

The spelling of 11990989 in words is "eleven million, nine hundred ninety thousand, nine hundred eighty-nine".