1183988989 has 2 divisors, whose sum is σ = 1183988990. Its totient is φ = 1183988988.

The previous prime is 1183988969. The next prime is 1183988999. The reversal of 1183988989 is 9898893811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1067132889 + 116856100 = 32667^2 + 10810^2 .

It is an emirp because it is prime and its reverse (9898893811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1183988989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1183988989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1183988969) 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, 591994494 + 591994495.

It is an arithmetic number, because the mean of its divisors is an integer number (591994495).

Almost surely, 2^1183988989 is an apocalyptic number.

It is an amenable number.

1183988989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1183988989 is an equidigital number, since it uses as much as digits as its factorization.

1183988989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 64.

The square root of 1183988989 is about 34409.1410674547. The cubic root of 1183988989 is about 1057.9112150533.

The spelling of 1183988989 in words is "one billion, one hundred eighty-three million, nine hundred eighty-eight thousand, nine hundred eighty-nine".