1189973989 has 2 divisors, whose sum is σ = 1189973990. Its totient is φ = 1189973988.

The previous prime is 1189973947. The next prime is 1189974017. The reversal of 1189973989 is 9893799811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 724148100 + 465825889 = 26910^2 + 21583^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189973989 - 2¹¹ = 1189971941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1189973989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189973929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594986994 + 594986995.

It is an arithmetic number, because the mean of its divisors is an integer number (594986995).

Almost surely, 2^1189973989 is an apocalyptic number.

It is an amenable number.

1189973989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189973989 is an equidigital number, since it uses as much as digits as its factorization.

1189973989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 64.

The square root of 1189973989 is about 34495.9996086503. Note that the first 3 decimals coincide. The cubic root of 1189973989 is about 1059.6907811112.

The spelling of 1189973989 in words is "one billion, one hundred eighty-nine million, nine hundred seventy-three thousand, nine hundred eighty-nine".