1331089266509 has 2 divisors, whose sum is σ = 1331089266510. Its totient is φ = 1331089266508.

The previous prime is 1331089266473. The next prime is 1331089266539. The reversal of 1331089266509 is 9056629801331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883365015625 + 447724250884 = 939875^2 + 669122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331089266509 - 2¹² = 1331089262413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331089266539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665544633254 + 665544633255.

It is an arithmetic number, because the mean of its divisors is an integer number (665544633255).

Almost surely, 2^{1331089266509} is an apocalyptic number.

It is an amenable number.

1331089266509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331089266509 is an equidigital number, since it uses as much as digits as its factorization.

1331089266509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 1331089266509 in words is "one trillion, three hundred thirty-one billion, eighty-nine million, two hundred sixty-six thousand, five hundred nine".