1331099909 has 2 divisors, whose sum is σ = 1331099910. Its totient is φ = 1331099908.

The previous prime is 1331099899. The next prime is 1331099911. The reversal of 1331099909 is 9099901331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810256225 + 520843684 = 28465^2 + 22822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331099909 - 2⁴ = 1331099893 is a prime.

Together with 1331099911, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331099909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331099989) 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, 665549954 + 665549955.

It is an arithmetic number, because the mean of its divisors is an integer number (665549955).

Almost surely, 2^1331099909 is an apocalyptic number.

It is an amenable number.

1331099909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331099909 is an equidigital number, since it uses as much as digits as its factorization.

1331099909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59049, while the sum is 44.

The square root of 1331099909 is about 36484.2419271663. The cubic root of 1331099909 is about 1100.0275224519.

The spelling of 1331099909 in words is "one billion, three hundred thirty-one million, ninety-nine thousand, nine hundred nine".