1311401009 has 2 divisors, whose sum is σ = 1311401010. Its totient is φ = 1311401008.

The previous prime is 1311400999. The next prime is 1311401011. The reversal of 1311401009 is 9001041131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288810000 + 22591009 = 35900^2 + 4753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311401009 is a prime.

It is a Sophie Germain prime.

Together with 1311401011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1311401059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655700504 + 655700505.

It is an arithmetic number, because the mean of its divisors is an integer number (655700505).

Almost surely, 2^1311401009 is an apocalyptic number.

It is an amenable number.

1311401009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311401009 is an equidigital number, since it uses as much as digits as its factorization.

1311401009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1311401009 is about 36213.2711723202. The cubic root of 1311401009 is about 1094.5741090285.

The spelling of 1311401009 in words is "one billion, three hundred eleven million, four hundred one thousand, nine".