1266119989 has 2 divisors, whose sum is σ = 1266119990. Its totient is φ = 1266119988.

The previous prime is 1266119977. The next prime is 1266120017. The reversal of 1266119989 is 9899116621.

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., 1105895025 + 160224964 = 33255^2 + 12658^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266119989 - 2⁷ = 1266119861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266119969) 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, 633059994 + 633059995.

It is an arithmetic number, because the mean of its divisors is an integer number (633059995).

Almost surely, 2^1266119989 is an apocalyptic number.

It is an amenable number.

1266119989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266119989 is an equidigital number, since it uses as much as digits as its factorization.

1266119989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 52.

The square root of 1266119989 is about 35582.5798530686. The cubic root of 1266119989 is about 1081.8281761748.

The spelling of 1266119989 in words is "one billion, two hundred sixty-six million, one hundred nineteen thousand, nine hundred eighty-nine".