1311423013121 has 4 divisors (see below), whose sum is σ = 1412301706452. Its totient is φ = 1210544319792.

The previous prime is 1311423013099. The next prime is 1311423013151. The reversal of 1311423013121 is 1213103241131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 392739102721 + 918683910400 = 626689^2 + 958480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311423013121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311423013151) 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 in 3 ways as a sum of consecutive naturals, for example, 50439346646 + ... + 50439346671.

It is an arithmetic number, because the mean of its divisors is an integer number (353075426613).

Almost surely, 2^{1311423013121} is an apocalyptic number.

It is an amenable number.

1311423013121 is a deficient number, since it is larger than the sum of its proper divisors (100878693331).

1311423013121 is a wasteful number, since it uses less digits than its factorization.

1311423013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100878693330.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 1311423013121 its reverse (1213103241131), we get a palindrome (2524526254252).

The spelling of 1311423013121 in words is "one trillion, three hundred eleven billion, four hundred twenty-three million, thirteen thousand, one hundred twenty-one".