1311231223109 has 4 divisors (see below), whose sum is σ = 1313005555680. Its totient is φ = 1309456890540.

The previous prime is 1311231223087. The next prime is 1311231223139. The reversal of 1311231223109 is 9013221321131.

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 1311231223109 - 2¹² = 1311231219013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311231223139) 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, 887165177 + ... + 887166654.

It is an arithmetic number, because the mean of its divisors is an integer number (328251388920).

Almost surely, 2^{1311231223109} is an apocalyptic number.

It is an amenable number.

1311231223109 is a deficient number, since it is larger than the sum of its proper divisors (1774332571).

1311231223109 is an equidigital number, since it uses as much as digits as its factorization.

1311231223109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774332570.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 1311231223109 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred nine".