1311213122009 has 4 divisors (see below), whose sum is σ = 1498529282304. Its totient is φ = 1123896961716.

The previous prime is 1311213122003. The next prime is 1311213122053. The reversal of 1311213122009 is 9002213121131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311213122009 - 2²⁰ = 1311212073433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311213122003) 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 in 3 ways as a sum of consecutive naturals, for example, 93658080137 + ... + 93658080150.

It is an arithmetic number, because the mean of its divisors is an integer number (374632320576).

Almost surely, 2^{1311213122009} is an apocalyptic number.

It is an amenable number.

1311213122009 is a deficient number, since it is larger than the sum of its proper divisors (187316160295).

1311213122009 is an equidigital number, since it uses as much as digits as its factorization.

1311213122009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187316160294.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 1311213122009 in words is "one trillion, three hundred eleven billion, two hundred thirteen million, one hundred twenty-two thousand, nine".